Wire up RTP keep-alive in ortc api.

webrtc/media/base/test/mock_mediachannel.h

Index: webrtc/media/base/test/mock_mediachannel.h
diff --git a/webrtc/media/base/test/mock_mediachannel.h b/webrtc/media/base/test/mock_mediachannel.h
index 6f7e2e5d05ffaf07df8ee175429ba90c63f53807..2d49d4770c2e77261b599d64f00516af705ff97a 100644
--- a/webrtc/media/base/test/mock_mediachannel.h
+++ b/webrtc/media/base/test/mock_mediachannel.h
@@ -18,15 +18,15 @@ namespace webrtc {
 
 class MockVideoMediaChannel : public cricket::FakeVideoMediaChannel {
  public:
-  MockVideoMediaChannel() :
-      cricket::FakeVideoMediaChannel(NULL, cricket::VideoOptions()) {}
+  MockVideoMediaChannel()
+      : cricket::FakeVideoMediaChannel(nullptr, cricket::VideoOptions()) {}
   MOCK_METHOD1(GetStats, bool(cricket::VideoMediaInfo*));
 };
 
 class MockVoiceMediaChannel : public cricket::FakeVoiceMediaChannel {
  public:
-  MockVoiceMediaChannel() :
-      cricket::FakeVoiceMediaChannel(NULL, cricket::AudioOptions()) {}
+  MockVoiceMediaChannel()
+      : cricket::FakeVoiceMediaChannel(nullptr, cricket::AudioOptions()) {}
   MOCK_METHOD1(GetStats, bool(cricket::VoiceMediaInfo*));
 };