Update WebFrameTestProxy and WebTestProxy to mostly follow Chrome style.

content/shell/renderer/test_runner/MockWebRTCDTMFSenderHandler.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_SHELL_RENDERER_TEST_RUNNER_MOCKWEBRTCDTMFSENDERHANDLER_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCKWEBRTCDTMFSENDERHANDLER_H_
 
 #include "base/basictypes.h"
 #include "content/shell/renderer/test_runner/TestCommon.h"
 #include "content/shell/renderer/test_runner/WebTask.h"
@@ skipping 10 matching lines @@
     MockWebRTCDTMFSenderHandler(const blink::WebMediaStreamTrack&, WebTestDelegate*);
 
     virtual void setClient(blink::WebRTCDTMFSenderHandlerClient*) OVERRIDE;
 
     virtual blink::WebString currentToneBuffer() OVERRIDE;
 
     virtual bool canInsertDTMF() OVERRIDE;
     virtual bool insertDTMF(const blink::WebString& tones, long duration, long interToneGap) OVERRIDE;
 
     // WebTask related methods
-    WebTaskList* taskList() { return &m_taskList; }
+    WebTaskList* mutable_task_list() { return &m_taskList; }
     void clearToneBuffer() { m_toneBuffer.reset(); }
 
 private:
     MockWebRTCDTMFSenderHandler();
 
     blink::WebRTCDTMFSenderHandlerClient* m_client;
     blink::WebMediaStreamTrack m_track;
     blink::WebString m_toneBuffer;
     WebTaskList m_taskList;
     WebTestDelegate* m_delegate;
 
     DISALLOW_COPY_AND_ASSIGN(MockWebRTCDTMFSenderHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCKWEBRTCDTMFSENDERHANDLER_H_