Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/tab_contents/spellchecker_submenu_observer_mac.cc

 // 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.
 
 #include "chrome/browser/tab_contents/spellchecker_submenu_observer.h"
 
 #include "base/logging.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/spellchecker/spellcheck_platform_mac.h"
@@ skipping 102 matching lines @@
 
   return false;
 }
 
 void SpellCheckerSubMenuObserver::ExecuteCommand(int command_id) {
   DCHECK(IsCommandIdSupported(command_id));
 
   RenderViewHost* rvh = proxy_->GetRenderViewHost();
   switch (command_id) {
     case IDC_CHECK_SPELLING_OF_THIS_FIELD:
-      rvh->Send(new SpellCheckMsg_ToggleSpellCheck(rvh->routing_id()));
+      rvh->Send(new SpellCheckMsg_ToggleSpellCheck(rvh->GetRoutingID()));
       break;
 
     case IDC_SPELLPANEL_TOGGLE:
       rvh->Send(new SpellCheckMsg_ToggleSpellPanel(
-          rvh->routing_id(), spellcheck_mac::SpellingPanelVisible()));
+          rvh->GetRoutingID(), spellcheck_mac::SpellingPanelVisible()));
       break;
   }
 }