Cleanup: Remove unneeded forward declarations in webkit/.

webkit/glue/media/simple_data_source.h

 // Copyright (c) 2011 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.
 
 // An extremely simple implementation of DataSource that downloads the entire
 // media resource into memory before signaling that initialization has finished.
 // Primarily used to test <audio> and <video> with buffering/caching removed
 // from the equation.
 
 #ifndef WEBKIT_GLUE_MEDIA_SIMPLE_DATA_SOURCE_H_
 #define WEBKIT_GLUE_MEDIA_SIMPLE_DATA_SOURCE_H_
 
 #include <algorithm>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "media/base/filter_factories.h"
 #include "media/base/filters.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebURLLoader.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebURLLoaderClient.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebURLRequest.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebURLResponse.h"
 #include "webkit/glue/media/web_data_source.h"
 
 class MessageLoop;
-class WebMediaPlayerDelegateImpl;
 
 namespace media {
 class MediaLog;
 }
 
 namespace webkit_glue {
 
 class SimpleDataSource
     : public WebDataSource,
       public WebKit::WebURLLoaderClient {
@@ skipping 104 matching lines @@
 
   // Used to ensure mocks for unittests are used instead of reset in Start().
   bool keep_test_loader_;
 
   DISALLOW_COPY_AND_ASSIGN(SimpleDataSource);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_MEDIA_SIMPLE_DATA_SOURCE_H_