Update WebFrameTestProxy and WebTestProxy to mostly follow Chrome style.

content/shell/renderer/test_runner/WebUserMediaClientMock.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_WEBUSERMEDIACLIENTMOCK_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_WEBUSERMEDIACLIENTMOCK_H_
 
 #include "base/basictypes.h"
 #include "content/shell/renderer/test_runner/TestCommon.h"
 #include "content/shell/renderer/test_runner/WebTask.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 #include "third_party/WebKit/public/web/WebUserMediaClient.h"
 
 namespace content {
 
 class WebTestDelegate;
 
 class WebUserMediaClientMock : public blink::WebUserMediaClient {
 public:
     explicit WebUserMediaClientMock(WebTestDelegate*);
     virtual ~WebUserMediaClientMock() { }
 
     virtual void requestUserMedia(const blink::WebUserMediaRequest&) OVERRIDE;
     virtual void cancelUserMediaRequest(const blink::WebUserMediaRequest&) OVERRIDE;
     virtual void requestMediaDevices(const blink::WebMediaDevicesRequest&) OVERRIDE;
     virtual void cancelMediaDevicesRequest(const blink::WebMediaDevicesRequest&) OVERRIDE;
 
     // Task related methods
-    WebTaskList* taskList() { return &m_taskList; }
+    WebTaskList* mutable_task_list() { return &m_taskList; }
 
 private:
     WebTaskList m_taskList;
     WebTestDelegate* m_delegate;
 
     DISALLOW_COPY_AND_ASSIGN(WebUserMediaClientMock);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_WEBUSERMEDIACLIENTMOCK_H_