Give the main frame a RenderWidget.

content/browser/web_contents/web_contents_impl.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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 463 matching lines @@
                       const FileChooserParams& params) override;
   bool IsFullscreenForCurrentTab() const override;
   blink::WebDisplayMode GetDisplayMode() const override;
   void UpdatePreferredSize(const gfx::Size& pref_size) override;
   void ResizeDueToAutoResize(const gfx::Size& new_size) override;
   void RequestToLockMouse(bool user_gesture,
                           bool last_unlocked_by_target) override;
   void LostMouseLock() override;
   void CreateNewWindow(
       SiteInstance* source_site_instance,
-      int route_id,
-      int main_frame_route_id,
+      int32 route_id,
+      int32 main_frame_route_id,
+      int32 main_frame_widget_route_id,
       const ViewHostMsg_CreateWindow_Params& params,
       SessionStorageNamespace* session_storage_namespace) override;
   void CreateNewWidget(int render_process_id,
                        int route_id,
                        blink::WebPopupType popup_type) override;
   void CreateNewFullscreenWidget(int render_process_id, int route_id) override;
   void ShowCreatedWindow(int route_id,
                          WindowOpenDisposition disposition,
                          const gfx::Rect& initial_rect,
                          bool user_gesture) override;
@@ skipping 811 matching lines @@
   // Adds/removes a callback called on creation of each new WebContents.
   static void AddCreatedCallbackForTesting(const CreatedCallback& callback);
   static void RemoveCreatedCallbackForTesting(const CreatedCallback& callback);
 
   DISALLOW_COPY_AND_ASSIGN(FriendZone);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_