Update WebFrameTestProxy and WebTestProxy to mostly follow Chrome style.

content/shell/renderer/test_runner/event_sender.h

 // Copyright 2014 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_EVENT_SENDER_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_EVENT_SENDER_H_
 
 #include <queue>
 #include <string>
 #include <vector>
@@ skipping 46 matching lines @@
   void SetContextMenuData(const blink::WebContextMenuData&);
 
   void DoDragDrop(const blink::WebDragData&, blink::WebDragOperationsMask);
 
   void MouseDown(int button_number, int modifiers);
   void MouseUp(int button_number, int modifiers);
   void KeyDown(const std::string& code_str,
                int modifiers,
                KeyLocationCode location);
 
-  WebTaskList* taskList() { return &task_list_; }
+  WebTaskList* mutable_task_list() { return &task_list_; }
 
  private:
   friend class EventSenderBindings;
 
   struct SavedEvent {
     enum SavedEventType {
       TYPE_UNSPECIFIED,
       TYPE_MOUSE_UP,
       TYPE_MOUSE_MOVE,
       TYPE_LEAP_FORWARD
@@ skipping 190 matching lines @@
   int click_count_;
 
   base::WeakPtrFactory<EventSender> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EventSender);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_EVENT_SENDER_H_