Give the main frame a RenderWidget.

content/browser/frame_host/interstitial_page_impl.h

 // Copyright 2013 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_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 104 matching lines @@
                          const IPC::Message& message) override;
   const GURL& GetMainFrameLastCommittedURL() const override;
   void RenderViewTerminated(RenderViewHost* render_view_host,
                             base::TerminationStatus status,
                             int error_code) override;
   RendererPreferences GetRendererPrefs(
       BrowserContext* browser_context) const override;
   gfx::Rect GetRootWindowResizerRect() const override;
   void CreateNewWindow(
       SiteInstance* source_site_instance,
-      int route_id,
-      int main_frame_route_id,
+      int32_t route_id,
+      int32_t main_frame_route_id,
+      int32_t main_frame_widget_route_id,
       const ViewHostMsg_CreateWindow_Params& params,
       SessionStorageNamespace* session_storage_namespace) override;
   void CreateNewWidget(int32 render_process_id,
                        int32 route_id,
                        blink::WebPopupType popup_type) override;
   void CreateNewFullscreenWidget(int32 render_process_id,
                                  int32 route_id) override;
   void ShowCreatedWindow(int route_id,
                          WindowOpenDisposition disposition,
                          const gfx::Rect& initial_rect,
@@ skipping 153 matching lines @@
   scoped_refptr<SessionStorageNamespace> session_storage_namespace_;
 
   base::WeakPtrFactory<InterstitialPageImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InterstitialPageImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_INTERSTITIAL_PAGE_IMPL_H_