Replacing most of web_task.h with base::Closure + base::WeakPtrFactory.

components/test_runner/mock_web_media_stream_center.cc

Index: components/test_runner/mock_web_media_stream_center.cc
diff --git a/components/test_runner/mock_web_media_stream_center.cc b/components/test_runner/mock_web_media_stream_center.cc
index a675f8ae89087710388f986cf7f292d9d76041f2..55c0c9474533ba5a4042c6b4ba29028cdc55d8ba 100644
--- a/components/test_runner/mock_web_media_stream_center.cc
+++ b/components/test_runner/mock_web_media_stream_center.cc
@@ -38,14 +38,6 @@ class MockWebAudioDestinationConsumer
 
 }  // namespace
 
-MockWebMediaStreamCenter::MockWebMediaStreamCenter(
-    blink::WebMediaStreamCenterClient* client,
-    TestInterfaces* interfaces) {
-}
-
-MockWebMediaStreamCenter::~MockWebMediaStreamCenter() {
-}
-
 void MockWebMediaStreamCenter::didEnableMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   track.source().setReadyState(blink::WebMediaStreamSource::ReadyStateLive);