extensions: Use V8 Maybe APIs in NativeHandler

extensions/renderer/object_backed_native_handler.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/object_backed_native_handler.h"
 
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "extensions/renderer/console.h"
 #include "extensions/renderer/module_system.h"
@@ skipping 10 matching lines @@
 ObjectBackedNativeHandler::ObjectBackedNativeHandler(ScriptContext* context)
     : router_data_(context->isolate()),
       context_(context),
       object_template_(context->isolate(),
                        v8::ObjectTemplate::New(context->isolate())) {
 }
 
 ObjectBackedNativeHandler::~ObjectBackedNativeHandler() {
 }
 
-v8::Local<v8::Object> ObjectBackedNativeHandler::NewInstance() {
+v8::MaybeLocal<v8::Object> ObjectBackedNativeHandler::NewInstance() {
   return v8::Local<v8::ObjectTemplate>::New(GetIsolate(), object_template_)
       ->NewInstance();
 }
 
 // static
 void ObjectBackedNativeHandler::Router(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::HandleScope handle_scope(args.GetIsolate());
   v8::Local<v8::Object> data = args.Data().As<v8::Object>();
 
@@ skipping 48 matching lines @@
     data->Delete(v8::String::NewFromUtf8(isolate, kHandlerFunction));
   }
 
   router_data_.Clear();
   object_template_.Reset();
 
   NativeHandler::Invalidate();
 }
 
 }  // namespace extensions