Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/tab_contents/spellchecker_submenu_observer_hunspell.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/browser_process.h"
 #include "chrome/browser/prefs/pref_member.h"
@@ skipping 157 matching lines @@
                                profile->GetPrefs(),
                                NULL);
       dictionary_language.SetValue(languages_[language]);
     }
     return;
   }
 
   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;
   }
 }