Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/sessions/restore_tab_helper.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/sessions/restore_tab_helper.h"
 
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/public/browser/notification_service.h"
@@ skipping 19 matching lines @@
     content::NotificationService::current()->Notify(
         content::NOTIFICATION_TAB_PARENTED,
         content::Source<TabContentsWrapper>(tab),
         content::NotificationService::NoDetails());
   }
 
   // Extension code in the renderer holds the ID of the window that hosts it.
   // Notify it that the window ID changed.
   web_contents()->GetRenderViewHost()->Send(
           new ExtensionMsg_UpdateBrowserWindowId(
-          web_contents()->GetRenderViewHost()->routing_id(), id.id()));
+          web_contents()->GetRenderViewHost()->GetRoutingID(), id.id()));
 }
 
 void RestoreTabHelper::RenderViewCreated(RenderViewHost* render_view_host) {
   render_view_host->Send(
-      new ExtensionMsg_UpdateBrowserWindowId(render_view_host->routing_id(),
+      new ExtensionMsg_UpdateBrowserWindowId(render_view_host->GetRoutingID(),
                                              window_id_.id()));
 }