Move WebMediaPlayerImpl and its dependencies to media/blink.

content/renderer/media/webmediaplayer_delegate.h

-// Copyright 2013 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 CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_DELEGATE_H_
-#define CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_DELEGATE_H_
-
-namespace blink {
-class WebMediaPlayer;
-}
-namespace content {
-
-// An interface to allow a WebMediaPlayerImpl to communicate changes of state
-// to objects that need to know.
-class WebMediaPlayerDelegate {
- public:
-  WebMediaPlayerDelegate() {}
-
-  // The specified player started playing media.
-  virtual void DidPlay(blink::WebMediaPlayer* player) = 0;
-
-  // The specified player stopped playing media.
-  virtual void DidPause(blink::WebMediaPlayer* player) = 0;
-
-  // The specified player was destroyed. Do not call any methods on it.
-  virtual void PlayerGone(blink::WebMediaPlayer* player) = 0;
-
- protected:
-  virtual ~WebMediaPlayerDelegate() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_DELEGATE_H_