Reland of "Revert of Update the BWE when the network route changes.

webrtc/p2p/base/faketransportcontroller.h

Index: webrtc/p2p/base/faketransportcontroller.h
diff --git a/webrtc/p2p/base/faketransportcontroller.h b/webrtc/p2p/base/faketransportcontroller.h
index 7b7aec59080ea2a50a5cc7b6dbb70d7265cd9717..59b618a0030c84fdbbeece9483f6a4e7bc68a8ea 100644
--- a/webrtc/p2p/base/faketransportcontroller.h
+++ b/webrtc/p2p/base/faketransportcontroller.h
@@ -476,6 +476,8 @@
     return remote_candidate_;
   }
 
+  bool ReadyToSendMedia() const override { return true; }
+
  private:
   Candidate local_candidate_;
   Candidate remote_candidate_;