Adding a MediaStream parameter to createSender.

talk/app/webrtc/peerconnection_unittest.cc

Index: talk/app/webrtc/peerconnection_unittest.cc
diff --git a/talk/app/webrtc/peerconnection_unittest.cc b/talk/app/webrtc/peerconnection_unittest.cc
index 49f450025af1ac8f916673cafafecf24585bcc47..17f1796ee4ac5527c3e6cf1b46fece66bcf8cc53 100644
--- a/talk/app/webrtc/peerconnection_unittest.cc
+++ b/talk/app/webrtc/peerconnection_unittest.cc
@@ -1797,8 +1797,10 @@ TEST_F(P2PTestConductor, DISABLED_LocalP2PTestWithVideoDecoderFactory) {
 // received end-to-end.
 TEST_F(P2PTestConductor, EarlyWarmupTest) {
   ASSERT_TRUE(CreateTestClients());
-  auto audio_sender = initializing_client()->pc()->CreateSender("audio");
-  auto video_sender = initializing_client()->pc()->CreateSender("video");
+  auto audio_sender =
+      initializing_client()->pc()->CreateSender("audio", nullptr);
+  auto video_sender =
+      initializing_client()->pc()->CreateSender("video", nullptr);
   initializing_client()->Negotiate();
   // Wait for ICE connection to complete, without any tracks.
   // Note that the receiving client WILL (in HandleIncomingOffer) create