Movable support for VideoReceiveStream::Config and avoid copies

webrtc/media/engine/fakewebrtccall.h

Index: webrtc/media/engine/fakewebrtccall.h
diff --git a/webrtc/media/engine/fakewebrtccall.h b/webrtc/media/engine/fakewebrtccall.h
index c9caf8e158ed0612c133f9e8feeb0a9db916c40d..8ca45f72d3228e77ef742696320b6d75bb054ce3 100644
--- a/webrtc/media/engine/fakewebrtccall.h
+++ b/webrtc/media/engine/fakewebrtccall.h
@@ -140,10 +140,9 @@ class FakeVideoSendStream final : public webrtc::VideoSendStream,
 
 class FakeVideoReceiveStream final : public webrtc::VideoReceiveStream {
  public:
-  explicit FakeVideoReceiveStream(
-      const webrtc::VideoReceiveStream::Config& config);
+  explicit FakeVideoReceiveStream(webrtc::VideoReceiveStream::Config config);
 
-  webrtc::VideoReceiveStream::Config GetConfig();
+  const webrtc::VideoReceiveStream::Config& GetConfig();
 
   bool IsReceiving() const;
 
@@ -199,7 +198,7 @@ class FakeCall final : public webrtc::Call, public webrtc::PacketReceiver {
   void DestroyVideoSendStream(webrtc::VideoSendStream* send_stream) override;
 
   webrtc::VideoReceiveStream* CreateVideoReceiveStream(
-      const webrtc::VideoReceiveStream::Config& config) override;
+      webrtc::VideoReceiveStream::Config config) override;
   void DestroyVideoReceiveStream(
       webrtc::VideoReceiveStream* receive_stream) override;
   webrtc::PacketReceiver* Receiver() override;