Replace window.external with a v8::extension.

chrome/renderer/external_js_object.cc

-// Copyright (c) 2006-2008 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/external_js_object.h"
-
-#include "chrome/renderer/render_view.h"
-
-ExternalJSObject::ExternalJSObject() : render_view_(NULL) {
-  BindMethod("AddSearchProvider", &ExternalJSObject::AddSearchProvider);
-}
-
-void ExternalJSObject::AddSearchProvider(const CppArgumentList& args,
-                                         CppVariant* result) {
-  DCHECK(render_view_);
-  result->SetNull();
-
-  if (render_view_) {
-    if (args.size() < 1 || !args[0].isString())
-      return;
-    render_view_->AddSearchProvider(args[0].ToString());
-  }
-}