Replace Handle<> with Local in remaining gin/*

gin/converter.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/converter.h"
 
 #include "v8/include/v8.h"
 
 using v8::ArrayBuffer;
 using v8::Boolean;
@@ skipping 148 matching lines @@
   *out = Handle<ArrayBuffer>::Cast(val);
   return true;
 }
 
 Handle<Value> Converter<Handle<External> >::ToV8(Isolate* isolate,
                                                  Handle<External> val) {
   return val.As<Value>();
 }
 
 bool Converter<Handle<External> >::FromV8(Isolate* isolate,
-                                          v8::Handle<Value> val,
+                                          v8::Local<Value> val,
                                           Handle<External>* out) {
   if (!val->IsExternal())
     return false;
   *out = Handle<External>::Cast(val);
   return true;
 }
 
 Handle<Value> Converter<Handle<Value> >::ToV8(Isolate* isolate,
                                               Handle<Value> val) {
   return val;
 }
 
 bool Converter<Handle<Value> >::FromV8(Isolate* isolate, Handle<Value> val,
                                        Handle<Value>* out) {
   *out = val;
   return true;
 }
 
-v8::Handle<v8::String> StringToSymbol(v8::Isolate* isolate,
+v8::Local<v8::String> StringToSymbol(v8::Isolate* isolate,
                                       const base::StringPiece& val) {
   return String::NewFromUtf8(isolate,
                              val.data(),
                              String::kInternalizedString,
                              static_cast<uint32_t>(val.length()));
 }
 
-std::string V8ToString(v8::Handle<v8::Value> value) {
+std::string V8ToString(v8::Local<v8::Value> value) {
   if (value.IsEmpty())
     return std::string();
   std::string result;
   if (!ConvertFromV8(NULL, value, &result))
     return std::string();
   return result;
 }
 
 }  // namespace gin