[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/guest_view/web_view/web_view_guest.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 EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_
 
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 250 matching lines @@
     return delegate.Pass();
   }
 
  private:
   friend class WebViewPermissionHelper;
 
   explicit WebViewGuest(content::WebContents* owner_web_contents);
 
   ~WebViewGuest() override;
 
-  void AttachWebViewHelpers(content::WebContents* contents);
-
   void ClearDataInternal(const base::Time remove_since,
                          uint32 removal_mask,
                          const base::Closure& callback);
 
   void OnWebViewNewWindowResponse(int new_window_instance_id,
                                   bool allow,
                                   const std::string& user_input);
 
   void OnFullscreenPermissionDecided(bool allowed,
                                      const std::string& user_input);
@@ skipping 126 matching lines @@
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<WebViewGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewGuest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_H_