diff --git a/sharing/proto/wire_format.proto b/sharing/proto/wire_format.proto
index d20329c3..57ec2660 100644
--- a/sharing/proto/wire_format.proto
+++ b/sharing/proto/wire_format.proto
@@ -183,7 +183,7 @@ message Frame {
   optional V1Frame v1 = 2;
 }
 
-// NEXT_ID=10
+// NEXT_ID=9
 message V1Frame {
   enum FrameType {
     UNKNOWN_FRAME_TYPE = 0;
@@ -196,8 +196,7 @@ message V1Frame {
     CANCEL = 6;
     // No longer used.
     PROGRESS_UPDATE = 7;
-    FILE_SYNC = 8;
-    BINDINGS = 9;
+    BINDINGS = 8;
   }
 
   optional FrameType type = 1;
@@ -209,8 +208,7 @@ message V1Frame {
   optional PairedKeyResultFrame paired_key_result = 5;
   optional CertificateInfoFrame certificate_info = 6 [deprecated = true];
   optional ProgressUpdateFrame progress_update = 7 [deprecated = true];
-  optional SyncFrame file_sync = 8;
-  optional BindingFrame bindings = 9;
+  optional BindingFrame bindings = 8;
 }
 
 // An introduction packet sent by the sending side. Contains a list of files
@@ -245,43 +243,6 @@ message ProgressUpdateFrame {
   optional bool start_transfer = 2;
 }
 
-// A packet for file sync messages.
-// NEXT_ID=3
-message SyncFrame {
-  oneof content {
-    SyncHandshake handshake = 1;
-    SyncConfig config = 2;
-  }
-}
-
-// A packet for file sync handshake messages.
-// NEXT_ID=1
-message SyncHandshake {}
-
-// A packet for file sync config messages.
-// NEXT_ID=2
-message SyncConfig {
-  repeated SyncFolder folders = 1;
-}
-
-// A packet for file sync folder messages.
-// NEXT_ID=5
-message SyncFolder {
-  // An identifier of the folder for the pair of source and target devices to
-  // uniquely identify it among all folders that are being synced.
-  optional string id = 1;
-  // Human readable name of the folder.
-  optional string label = 2;
-  // A randomly generated id when the index is created. Regenerate when the
-  // index is reset.
-  optional int32 index_id = 3;
-  // The maximum sequence number of the folder. Each number represents an update
-  // to a file in the folder. Sequence numbers are only valid within the scope
-  // of a valid index_id. If an index is reset, all sequence numbers need to be
-  // regenerated, including max_sequence.
-  optional int64 max_sequence = 4;
-}
-
 // Messages used to create pair bindings between devices.
 // An initiator device requests a new bindingId from the BE using the
 // InitiateBinding rpc.  This new bindingId is passed to the peer device using