diff --git a/sharing/fake_nearby_sharing_service.cc b/sharing/fake_nearby_sharing_service.cc
index 4dfb048b..15868a2c 100644
--- a/sharing/fake_nearby_sharing_service.cc
+++ b/sharing/fake_nearby_sharing_service.cc
@@ -41,9 +41,6 @@ void FakeNearbySharingService::AddObserver(Observer* observer) {
 void FakeNearbySharingService::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
-bool FakeNearbySharingService::HasObserver(Observer* observer) {
-  return observers_.HasObserver(observer);
-}
 
 // Shutdown the Nearby Sharing service, and cleanup.
 void FakeNearbySharingService::Shutdown(
@@ -194,24 +191,6 @@ void FakeNearbySharingService::FireStartDiscoveryResult(bool success) {
   }
 }
 
-void FakeNearbySharingService::FireFastInitiationDevicesDetected() {
-  for (auto& observer : observers_.GetObservers()) {
-    observer->OnFastInitiationDevicesDetected();
-  }
-}
-
-void FakeNearbySharingService::FireFastInitiationDevicesNotDetected() {
-  for (auto& observer : observers_.GetObservers()) {
-    observer->OnFastInitiationDevicesNotDetected();
-  }
-}
-
-void FakeNearbySharingService::FireFastInitiationScanningStopped() {
-  for (auto& observer : observers_.GetObservers()) {
-    observer->OnFastInitiationScanningStopped();
-  }
-}
-
 void FakeNearbySharingService::FireShutdown() {
   for (auto& observer : observers_.GetObservers()) {
     observer->OnShutdown();
diff --git a/sharing/fake_nearby_sharing_service.h b/sharing/fake_nearby_sharing_service.h
index a754e451..fd8449a0 100644
--- a/sharing/fake_nearby_sharing_service.h
+++ b/sharing/fake_nearby_sharing_service.h
@@ -42,7 +42,6 @@ class FakeNearbySharingService : public NearbySharingService {
 
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
-  bool HasObserver(Observer* observer) override;
 
   // Shutdown the Nearby Sharing service, and cleanup.
   void Shutdown(
@@ -119,9 +118,6 @@ class FakeNearbySharingService : public NearbySharingService {
   void FireHighVisibilityChanged(bool in_high_visibility);
   void FireStartAdvertisingFailure();
   void FireStartDiscoveryResult(bool success);
-  void FireFastInitiationDevicesDetected();
-  void FireFastInitiationDevicesNotDetected();
-  void FireFastInitiationScanningStopped();
   void FireShutdown();
 
   // Fire transfer update events.
diff --git a/sharing/nearby_sharing_service.h b/sharing/nearby_sharing_service.h
index a16c05b7..dce269c3 100644
--- a/sharing/nearby_sharing_service.h
+++ b/sharing/nearby_sharing_service.h
@@ -109,10 +109,6 @@ class NearbySharingService {
     virtual void OnStartAdvertisingFailure() {}
     virtual void OnStartDiscoveryResult(bool success) {}
 
-    virtual void OnFastInitiationDevicesDetected() {}
-    virtual void OnFastInitiationDevicesNotDetected() {}
-    virtual void OnFastInitiationScanningStopped() {}
-
     virtual void OnBluetoothStatusChanged(AdapterState state) {}
     virtual void OnWifiStatusChanged(AdapterState state) {}
     virtual void OnLanStatusChanged(AdapterState state) {}
@@ -131,7 +127,6 @@ class NearbySharingService {
 
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
-  virtual bool HasObserver(Observer* observer) = 0;
 
   // Shutdown the Nearby Sharing service, and cleanup.
   virtual void Shutdown(
diff --git a/sharing/nearby_sharing_service_impl.cc b/sharing/nearby_sharing_service_impl.cc
index 8af1384d..26e9d740 100644
--- a/sharing/nearby_sharing_service_impl.cc
+++ b/sharing/nearby_sharing_service_impl.cc
@@ -401,11 +401,6 @@ void NearbySharingServiceImpl::RemoveObserver(
   observers_.RemoveObserver(observer);
 }
 
-bool NearbySharingServiceImpl::HasObserver(
-    NearbySharingService::Observer* observer) {
-  return observers_.HasObserver(observer);
-}
-
 void NearbySharingServiceImpl::RegisterSendSurface(
     TransferUpdateCallback* transfer_callback,
     ShareTargetDiscoveredCallback* discovery_callback, SendSurfaceState state,
@@ -2307,26 +2302,11 @@ void NearbySharingServiceImpl::StartFastInitiationScanning() {
   }
 
   nearby_fast_initiation_->StartScanning(
-      [this]() { OnFastInitiationDevicesDetected(); },
-      [this]() { OnFastInitiationDevicesNotDetected(); },
+      /*devices_discovered_callback=*/[]() {},
+      /*devices_not_discovered_callback=*/[]() {},
       [this]() { StopFastInitiationScanning(); });
 }
 
-void NearbySharingServiceImpl::OnFastInitiationDevicesDetected() {
-  VLOG(1) << __func__;
-
-  for (auto& observer : observers_.GetObservers()) {
-    observer->OnFastInitiationDevicesDetected();
-  }
-}
-
-void NearbySharingServiceImpl::OnFastInitiationDevicesNotDetected() {
-  VLOG(1) << __func__;
-  for (auto& observer : observers_.GetObservers()) {
-    observer->OnFastInitiationDevicesNotDetected();
-  }
-}
-
 void NearbySharingServiceImpl::StopFastInitiationScanning() {
   VLOG(1) << __func__ << ": Stop fast initiation scanning.";
   if (!nearby_fast_initiation_->IsScanning()) {
@@ -2335,10 +2315,6 @@ void NearbySharingServiceImpl::StopFastInitiationScanning() {
 
   nearby_fast_initiation_->StopScanning(
       []() { VLOG(1) << __func__ << ": Stopped fast initiation scanning."; });
-
-  for (auto& observer : observers_.GetObservers()) {
-    observer->OnFastInitiationScanningStopped();
-  }
   VLOG(1) << __func__ << ": Stopped background scanning.";
 }
 
diff --git a/sharing/nearby_sharing_service_impl.h b/sharing/nearby_sharing_service_impl.h
index 887be53e..a4ada80b 100644
--- a/sharing/nearby_sharing_service_impl.h
+++ b/sharing/nearby_sharing_service_impl.h
@@ -112,7 +112,6 @@ class NearbySharingServiceImpl
   // NearbySharingService
   void AddObserver(NearbySharingService::Observer* observer) override;
   void RemoveObserver(NearbySharingService::Observer* observer) override;
-  bool HasObserver(NearbySharingService::Observer* observer) override;
   void Shutdown(
       std::function<void(StatusCodes)> status_codes_callback) override;
   ABSL_DEPRECATED("Use the variant with vendor ID instead.")
@@ -296,7 +295,6 @@ class NearbySharingServiceImpl
 
   void InvalidateFastInitiationScanning();
   void StartFastInitiationScanning();
-  void OnFastInitiationDevicesDetected();
   void OnFastInitiationDevicesNotDetected();
   void StopFastInitiationScanning();
 
diff --git a/sharing/nearby_sharing_service_impl_test.cc b/sharing/nearby_sharing_service_impl_test.cc
index f52ea277..d2151fd5 100644
--- a/sharing/nearby_sharing_service_impl_test.cc
+++ b/sharing/nearby_sharing_service_impl_test.cc
@@ -1365,16 +1365,6 @@ class TestObserver : public NearbySharingService::Observer {
     on_start_advertising_failure_called_ = true;
   }
 
-  void OnFastInitiationDevicesDetected() override {
-    devices_detected_called_ = true;
-  }
-  void OnFastInitiationDevicesNotDetected() override {
-    devices_not_detected_called_ = true;
-  }
-  void OnFastInitiationScanningStopped() override {
-    scanning_stopped_called_ = true;
-  }
-
   void OnBluetoothStatusChanged(AdapterState state) override {
     bluetooth_state_ = state;
   }
@@ -1394,9 +1384,6 @@ class TestObserver : public NearbySharingService::Observer {
   bool in_high_visibility_ = false;
   bool shutdown_called_ = false;
   bool on_start_advertising_failure_called_ = false;
-  bool devices_detected_called_ = false;
-  bool devices_not_detected_called_ = false;
-  bool scanning_stopped_called_ = false;
   bool credential_error_called_ = false;
   NearbySharingService* service_;
   AdapterState bluetooth_state_ = AdapterState::INVALID;
@@ -1541,25 +1528,6 @@ TEST_F(NearbySharingServiceImplTest, FastInitiationScanning_StartAndStop) {
   EXPECT_EQ(fast_initiation->StopScanningCount(), 1);
 }
 
-TEST_F(NearbySharingServiceImplTest, FastInitiationScanning_NotifyObservers) {
-  FakeNearbyFastInitiation* fast_initiation =
-      nearby_fast_initiation_factory_->GetNearbyFastInitiation();
-  SetConnectionType(ConnectionType::kBluetooth);
-
-  TestObserver observer(service_.get());
-
-  ASSERT_EQ(fast_initiation->StartScanningCount(), 1);
-
-  fast_initiation->FireDevicesDetected();
-  EXPECT_TRUE(observer.devices_detected_called_);
-  fast_initiation->FireDevicesNotDetected();
-  EXPECT_TRUE(observer.devices_not_detected_called_);
-
-  // Remove the observer before it goes out of scope.
-  service_->RemoveObserver(&observer);
-  FlushTesting();
-}
-
 TEST_F(NearbySharingServiceImplTest,
        FastInitiationScanning_PostTransferCooldown) {
   FakeNearbyFastInitiation* fast_initiation =