Replace Handle<> with Local in remaining gin/*

gin/function_template.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 "gin/function_template.h"
 
 namespace gin {
 
 namespace internal {
 
 CallbackHolderBase::CallbackHolderBase(v8::Isolate* isolate)
     : v8_ref_(isolate, v8::External::New(isolate, this)) {
   v8_ref_.SetWeak(this, &CallbackHolderBase::FirstWeakCallback,
                   v8::WeakCallbackType::kParameter);
 }
 
 CallbackHolderBase::~CallbackHolderBase() {
   DCHECK(v8_ref_.IsEmpty());
 }
 
-v8::Handle<v8::External> CallbackHolderBase::GetHandle(v8::Isolate* isolate) {
+v8::Local<v8::External> CallbackHolderBase::GetHandle(v8::Isolate* isolate) {
   return v8::Local<v8::External>::New(isolate, v8_ref_);
 }
 
 // static
 void CallbackHolderBase::FirstWeakCallback(
     const v8::WeakCallbackInfo<CallbackHolderBase>& data) {
   data.GetParameter()->v8_ref_.Reset();
   data.SetSecondPassCallback(SecondWeakCallback);
 }
 
 // static
 void CallbackHolderBase::SecondWeakCallback(
     const v8::WeakCallbackInfo<CallbackHolderBase>& data) {
   delete data.GetParameter();
 }
 
 }  // namespace internal
 
 }  // namespace gin