components: Cleanup class/struct fwd declarations

components/test_runner/mock_web_media_stream_center.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_TEST_RUNNER_MOCK_WEB_MEDIA_STREAM_CENTER_H_
 #define COMPONENTS_TEST_RUNNER_MOCK_WEB_MEDIA_STREAM_CENTER_H_
 
 #include "base/macros.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamCenter.h"
 
 namespace blink {
 class WebAudioSourceProvider;
-class WebMediaStreamCenterClient;
 };
 
 namespace test_runner {
 
-class TestInterfaces;
-
 class MockWebMediaStreamCenter : public blink::WebMediaStreamCenter {
  public:
   MockWebMediaStreamCenter() = default;
   ~MockWebMediaStreamCenter() override {};
 
   void didEnableMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
   void didDisableMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
   bool didAddMediaStreamTrack(const blink::WebMediaStream& stream,
                               const blink::WebMediaStreamTrack& track) override;
   bool didRemoveMediaStreamTrack(
       const blink::WebMediaStream& stream,
       const blink::WebMediaStreamTrack& track) override;
   void didStopLocalMediaStream(const blink::WebMediaStream& stream) override;
   bool didStopMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
   void didCreateMediaStream(blink::WebMediaStream& stream) override;
   blink::WebAudioSourceProvider* createWebAudioSourceFromMediaStreamTrack(
       const blink::WebMediaStreamTrack& track) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockWebMediaStreamCenter);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_MOCK_WEB_MEDIA_STREAM_CENTER_H_