Revert 222102 "Remove unsafe access hacks from ScopedPersistent."

trunk/src/chrome/renderer/extensions/render_view_observer_natives.cc

 // Copyright 2013 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/extensions/render_view_observer_natives.h"
 
 #include "chrome/common/extensions/api/extension_api.h"
 #include "chrome/renderer/extensions/dispatcher.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/renderer/render_view_observer.h"
@@ skipping 22 matching lines @@
   virtual void DidFailProvisionalLoad(
       WebKit::WebFrame* frame,
       const WebKit::WebURLError& error) OVERRIDE {
     CallbackAndDie(false);
   }
 
  private:
   void CallbackAndDie(bool succeeded) {
     v8::HandleScope handle_scope(context_->isolate());
     v8::Handle<v8::Value> args[] = { v8::Boolean::New(succeeded) };
-    context_->CallFunction(callback_.NewHandle(context_->isolate()), 1, args);
+    context_->CallFunction(callback_.get(), 1, args);
     delete this;
   }
 
   ChromeV8Context* context_;
   ScopedPersistent<v8::Function> callback_;
   DISALLOW_COPY_AND_ASSIGN(LoadWatcher);
 };
 }  // namespace
 
 
@@ skipping 18 matching lines @@
     LOG(WARNING) << "No render view found to register LoadWatcher.";
     return;
   }
 
   new LoadWatcher(context(), view, args[1].As<v8::Function>());
 
   args.GetReturnValue().Set(true);
 }
 
 }  // namespace extensions