Replace window.external with a v8::extension.

chrome/renderer/render_view.cc

 // Copyright (c) 2009 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/renderer/render_view.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1484 matching lines @@
 }
 
 void RenderView::BindDOMAutomationController(WebFrame* webframe) {
   dom_automation_controller_.set_message_sender(this);
   dom_automation_controller_.set_routing_id(routing_id_);
   dom_automation_controller_.BindToJavascript(webframe,
                                               L"domAutomationController");
 }
 
 void RenderView::WindowObjectCleared(WebFrame* webframe) {
-  external_js_object_.set_render_view(this);
-  external_js_object_.BindToJavascript(webframe, L"external");
   if (BindingsPolicy::is_dom_automation_enabled(enabled_bindings_))
     BindDOMAutomationController(webframe);
   if (BindingsPolicy::is_dom_ui_enabled(enabled_bindings_)) {
     dom_ui_bindings_.set_message_sender(this);
     dom_ui_bindings_.set_routing_id(routing_id_);
     dom_ui_bindings_.BindToJavascript(webframe, L"chrome");
   }
   if (BindingsPolicy::is_external_host_enabled(enabled_bindings_)) {
     external_host_bindings_.set_message_sender(this);
     external_host_bindings_.set_routing_id(routing_id_);
@@ skipping 1482 matching lines @@
     }
   }
   UMA_HISTOGRAM_TIMES("Renderer.All.StartToFinishDoc", start_to_finish_doc);
   UMA_HISTOGRAM_TIMES("Renderer.All.FinishDocToFinish", finish_doc_to_finish);
   UMA_HISTOGRAM_TIMES("Renderer.All.StartToFinish", start_to_finish);
   if (start_to_first_layout.ToInternalValue() >= 0) {
     UMA_HISTOGRAM_TIMES(
       "Renderer.All.StartToFirstLayout", start_to_first_layout);
   }
 }