[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/guest_view/web_view/web_view_guest_delegate.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_DELEGATE_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_DELEGATE_H_
 
 #include "base/callback.h"
 #include "components/guest_view/browser/guest_view_base.h"
 
@@ skipping 17 matching lines @@
 class WebViewGuestDelegate {
  public :
   virtual ~WebViewGuestDelegate() {}
 
   typedef std::vector<linked_ptr<api::web_view_internal::ContextMenuItem> >
       MenuItemVector;
 
   // Called when context menu operation was handled.
   virtual bool HandleContextMenu(const content::ContextMenuParams& params) = 0;
 
-  // Called to attach helpers just after additional initialization is performed.
-  virtual void OnAttachWebViewHelpers(content::WebContents* contents) = 0;
-
   // Called just after additional initialization is performed.
   virtual void OnDidInitialize() = 0;
 
   // Called immediately after the guest WebContents has been destroyed.
   virtual void OnGuestDestroyed() = 0;
 
   // Shows the context menu for the guest.
   // |items| acts as a filter. This restricts the current context's default
   // menu items to contain only the items from |items|.
   // |items| == NULL means no filtering will be applied.
   virtual void OnShowContextMenu(
       int request_id,
       const MenuItemVector* items) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_WEB_VIEW_WEB_VIEW_GUEST_DELEGATE_H_