Give the main frame a RenderWidget.

extensions/browser/guest_view/extension_options/extension_options_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_EXTENSION_OPTIONS_EXTENSION_OPTIONS_GUEST_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_EXTENSION_OPTIONS_EXTENSION_OPTIONS_GUEST_H_
 
 #include "base/macros.h"
 #include "components/guest_view/browser/guest_view.h"
 #include "extensions/browser/guest_view/extension_options/extension_options_guest_delegate.h"
@@ skipping 25 matching lines @@
   bool ShouldHandleFindRequestsForEmbedder() const override;
 
   // content::WebContentsDelegate implementation.
   content::WebContents* OpenURLFromTab(
       content::WebContents* source,
       const content::OpenURLParams& params) override;
   void CloseContents(content::WebContents* source) override;
   bool HandleContextMenu(const content::ContextMenuParams& params) override;
   bool ShouldCreateWebContents(
       content::WebContents* web_contents,
-      int route_id,
-      int main_frame_route_id,
+      int32 route_id,
+      int32 main_frame_route_id,
+      int32 main_frame_widget_route_id,
       WindowContainerType window_container_type,
       const std::string& frame_name,
       const GURL& target_url,
       const std::string& partition_id,
       content::SessionStorageNamespace* session_storage_namespace) override;
 
   // content::WebContentsObserver implementation.
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
 
  private:
   explicit ExtensionOptionsGuest(content::WebContents* owner_web_contents);
   ~ExtensionOptionsGuest() override;
 
   scoped_ptr<extensions::ExtensionOptionsGuestDelegate>
       extension_options_guest_delegate_;
   GURL options_page_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionOptionsGuest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_EXTENSION_OPTIONS_EXTENSION_OPTIONS_GUEST_H_