Update MediaStreamTrack::Stop to latest draft.

content/renderer/media/webrtc_audio_capturer_unittest.cc

Index: content/renderer/media/webrtc_audio_capturer_unittest.cc
diff --git a/content/renderer/media/webrtc_audio_capturer_unittest.cc b/content/renderer/media/webrtc_audio_capturer_unittest.cc
index d0bcf296c6042413fc3785809ea3fa5c731a1ae3..8b67aeab8502dbe40c7f903a5f6d2cbf38dc9655 100644
--- a/content/renderer/media/webrtc_audio_capturer_unittest.cc
+++ b/content/renderer/media/webrtc_audio_capturer_unittest.cc
@@ -96,13 +96,13 @@ class WebRtcAudioCapturerTest : public testing::Test {
                              "", "", params_.sample_rate(),
                              params_.channel_layout(),
                              params_.frames_per_buffer()),
-        constraints, NULL);
+        constraints, NULL, NULL);
     capturer_source_ = new MockCapturerSource();
     EXPECT_CALL(*capturer_source_.get(), Initialize(_, capturer_.get(), -1));
-    capturer_->SetCapturerSourceForTesting(capturer_source_, params_);
-
     EXPECT_CALL(*capturer_source_.get(), SetAutomaticGainControl(true));
     EXPECT_CALL(*capturer_source_.get(), Start());
+    capturer_->SetCapturerSourceForTesting(capturer_source_, params_);
+
     scoped_refptr<WebRtcLocalAudioTrackAdapter> adapter(
         WebRtcLocalAudioTrackAdapter::Create(std::string(), NULL));
     track_.reset(new WebRtcLocalAudioTrack(adapter, capturer_, NULL));