chrome: Cleanup class/struct forward declarations

chrome/renderer/media/chrome_webrtc_log_message_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 CHROME_RENDERER_MEDIA_CHROME_WEBRTC_LOG_MESSAGE_DELEGATE_H_
 #define CHROME_RENDERER_MEDIA_CHROME_WEBRTC_LOG_MESSAGE_DELEGATE_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/common/media/webrtc_logging_message_data.h"
 #include "content/public/renderer/webrtc_log_message_delegate.h"
 #include "ipc/ipc_channel_proxy.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
-class PartialCircularBuffer;
 class WebRtcLoggingMessageFilter;
 
 // ChromeWebRtcLogMessageDelegate handles WebRTC logging. There is one object
 // per render process, owned by WebRtcLoggingMessageFilter. It communicates with
 // WebRtcLoggingHandlerHost and receives logging messages from libjingle and
 // writes them to a shared memory buffer.
 class ChromeWebRtcLogMessageDelegate
     : public content::WebRtcLogMessageDelegate,
       public base::NonThreadSafe {
  public:
@@ skipping 20 matching lines @@
   std::vector<WebRtcLoggingMessageData> log_buffer_;
 
   base::TimeTicks last_log_buffer_send_;
 
   WebRtcLoggingMessageFilter* message_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeWebRtcLogMessageDelegate);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_CHROME_WEBRTC_LOG_MESSAGE_DELEGATE_H_