Give the main frame a RenderWidget.

content/browser/renderer_host/render_view_host_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_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 273 matching lines @@
   bool OnMessageReceived(const IPC::Message& msg) override;
   void GotFocus() override;
   void LostCapture() override;
   void LostMouseLock() override;
   void SetIsLoading(bool is_loading) override;
   void ForwardMouseEvent(const blink::WebMouseEvent& mouse_event) override;
   void ForwardKeyboardEvent(const NativeWebKeyboardEvent& key_event) override;
   gfx::Rect GetRootWindowResizerRect() const override;
 
   // Creates a new RenderView with the given route id.
-  void CreateNewWindow(
-      int route_id,
-      int main_frame_route_id,
-      const ViewHostMsg_CreateWindow_Params& params,
-      SessionStorageNamespace* session_storage_namespace);
+  void CreateNewWindow(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);
 
   // Creates a new RenderWidget with the given route id.  |popup_type| indicates
   // if this widget is a popup and what kind of popup it is (select, autofill).
   void CreateNewWidget(int32 route_id,
                        blink::WebPopupType popup_type);
 
   // Creates a full screen RenderWidget.
   void CreateNewFullscreenWidget(int32 route_id);
 
   void set_main_frame_routing_id(int routing_id) {
@@ skipping 182 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_