Roll forward to cl/314549634

Change-Id: I4d1e7eacd5fa4078a094571ad6d5f51e422535ff

cpp/platform_v2/base/byte_array.h

@@ -19,7 +19,9 @@ class ByteArray {
   ByteArray& operator=(ByteArray&&) = default;
 
   // Create ByteArray from string.
-  explicit ByteArray(absl::string_view source) { data_ = source; }
+  explicit ByteArray(absl::string_view source) {
+    SetData(source.data(), source.size());
+  }
 
   // Create default-initialized ByteArray of a given size.
   explicit ByteArray(size_t size) { SetData(size); }