Added VideoTrackInterface::GetSink method, for use by VideoRtpReceiver. Get rid of FrameInput.

talk/app/webrtc/videosource_unittest.cc

Index: talk/app/webrtc/videosource_unittest.cc
diff --git a/talk/app/webrtc/videosource_unittest.cc b/talk/app/webrtc/videosource_unittest.cc
index a2aaeba9da653ef2352de25e43bd45396b4a016a..4759b0c06af6593480b403834719343a74f2b2e7 100644
--- a/talk/app/webrtc/videosource_unittest.cc
+++ b/talk/app/webrtc/videosource_unittest.cc
@@ -206,6 +206,7 @@ TEST_F(VideoSourceTest, StopRestart) {
   source_->Stop();
 }
 
+#if 0
 // Test start stop with a remote VideoSource - the video source that has a
 // RemoteVideoCapturer and takes video frames from FrameInput.
 TEST_F(VideoSourceTest, StartStopRemote) {
@@ -231,6 +232,7 @@ TEST_F(VideoSourceTest, StartStopRemote) {
   EXPECT_EQ_WAIT(MediaSourceInterface::kEnded, state_observer_->state(),
                  kMaxWaitMs);
 }
+#endif
 
 // Test that a VideoSource transition to kEnded if the capture device
 // fails.