Update WebFrameTestProxy and WebTestProxy to mostly follow Chrome style.

content/shell/renderer/test_runner/WebTask.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_WEBTASK_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_WEBTASK_H_
 
 #include <vector>
 
 namespace content {
@@ skipping 23 matching lines @@
     void registerTask(WebTask*);
     void unregisterTask(WebTask*);
     void revokeAll();
 
 private:
     std::vector<WebTask*> m_tasks;
 };
 
 // A task containing an object pointer of class T. Derived classes should
 // override runIfValid() which in turn can safely invoke methods on the
-// m_object. The Class T must have "WebTaskList* taskList()".
+// m_object. The Class T must have "WebTaskList* mutable_task_list()".
 template<class T>
 class WebMethodTask : public WebTask {
 public:
     explicit WebMethodTask(T* object)
-        : WebTask(object->taskList())
+        : WebTask(object->mutable_task_list())
         , m_object(object)
     {
     }
 
     virtual ~WebMethodTask() { }
 
     virtual void run()
     {
         if (m_object)
             runIfValid();
     }
 
     virtual void cancel()
     {
         m_object = 0;
         m_taskList->unregisterTask(this);
         m_taskList = 0;
     }
 
     virtual void runIfValid() = 0;
 
 protected:
     T* m_object;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_WEBTASK_H_