Use V8 Maybe APIs in extensions/renderer

extensions/renderer/render_view_observer_natives.cc

 // Copyright 2014 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 "extensions/renderer/render_view_observer_natives.h"
 
 #include "content/public/renderer/render_view.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "extensions/common/extension_api.h"
 #include "extensions/renderer/script_context.h"
@@ skipping 45 matching lines @@
                 base::Bind(&RenderViewObserverNatives::OnDocumentElementCreated,
                            base::Unretained(this)));
 }
 
 void RenderViewObserverNatives::OnDocumentElementCreated(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK(args.Length() == 2);
   CHECK(args[0]->IsInt32());
   CHECK(args[1]->IsFunction());
 
-  int view_id = args[0]->Int32Value();
+  int view_id = args[0].As<v8::Int32>()->Value();
 
   content::RenderView* view = content::RenderView::FromRoutingID(view_id);
   if (!view) {
     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