Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/automation/automation_provider_win.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/automation/automation_provider.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/debug/trace_event.h"
 #include "base/json/json_reader.h"
@@ skipping 343 matching lines @@
 
 void AutomationProvider::OnMessageFromExternalHost(int handle,
                                                    const std::string& message,
                                                    const std::string& origin,
                                                    const std::string& target) {
   RenderViewHost* view_host = GetViewForTab(handle);
   if (!view_host)
     return;
 
   view_host->Send(new ChromeViewMsg_HandleMessageFromExternalHost(
-      view_host->routing_id(), message, origin, target));
+      view_host->GetRoutingID(), message, origin, target));
 }
 
 void AutomationProvider::NavigateInExternalTab(
     int handle, const GURL& url, const GURL& referrer,
     AutomationMsg_NavigationResponseValues* status) {
   *status = AUTOMATION_MSG_NAVIGATION_ERROR;
 
   if (tab_tracker_->ContainsHandle(handle)) {
     NavigationController* tab = tab_tracker_->GetResource(handle);
     tab->LoadURL(
@@ skipping 27 matching lines @@
 void AutomationProvider::OnSetZoomLevel(int handle, int zoom_level) {
   if (tab_tracker_->ContainsHandle(handle)) {
     NavigationController* tab = tab_tracker_->GetResource(handle);
     if (tab->GetWebContents() && tab->GetWebContents()->GetRenderViewHost()) {
       RenderViewHost* host = tab->GetWebContents()->GetRenderViewHost();
       content::PageZoom zoom = static_cast<content::PageZoom>(zoom_level);
       host->Zoom(zoom);
     }
   }
 }