Revert half of the changes from 137638 that are probably causing breakages in

chrome/browser/extensions/page_action_controller.h

 // Copyright (c) 2012 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_BROWSER_EXTENSIONS_PAGE_ACTION_CONTROLLER_H_
 #define CHROME_BROWSER_EXTENSIONS_PAGE_ACTION_CONTROLLER_H_
 #pragma once
 
 #include <set>
 #include <string>
 
 #include "base/observer_list.h"
 #include "chrome/browser/extensions/action_box_controller.h"
-#include "chrome/browser/extensions/extension_tab_helper.h"
 
 class ExtensionService;
 class TabContentsWrapper;
 
 namespace extensions {
 
 // An ActionBoxController which corresponds to the page actions of an extension.
-class PageActionController : public ActionBoxController,
-                             public ExtensionTabHelper::Observer {
+class PageActionController : public ActionBoxController {
  public:
-  PageActionController(TabContentsWrapper* tab_contents,
-                       ExtensionTabHelper* tab_helper);
+  explicit PageActionController(TabContentsWrapper* tab_contents);
   virtual ~PageActionController();
 
   // ActionBoxController implementation.
   virtual scoped_ptr<std::vector<ExtensionAction*> > GetCurrentActions()
       OVERRIDE;
   virtual Action OnClicked(const std::string& extension_id,
                            int mouse_button) OVERRIDE;
 
-  // ExtensionTabHelper::Observer implementation.
-  virtual void OnPageActionStateChanged() OVERRIDE;
-
  private:
   // Gets the ExtensionService for |tab_contents_|.
   ExtensionService* GetExtensionService();
 
   TabContentsWrapper* tab_contents_;
 
-  ExtensionTabHelper* tab_helper_;
-
   DISALLOW_COPY_AND_ASSIGN(PageActionController);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_PAGE_ACTION_CONTROLLER_H_