Delete obsolete method FrameInput from MockVideoSource.

content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
index c414454a926a24d12d29c79e408018db6d7865b8..b63fda4b5a1886ff4b45bd97fa6881f4a02f44d3 100644
--- a/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/mock_peer_connection_dependency_factory.cc
@@ -225,10 +225,6 @@ void MockVideoSource::Restart() {
   NOTIMPLEMENTED();
 }
 
-cricket::VideoRenderer* MockVideoSource::FrameInput() {
-  return &renderer_;
-}
-
 void MockVideoSource::RegisterObserver(webrtc::ObserverInterface* observer) {
   observers_.push_back(observer);
 }