Replace Handle<> with Local in remaining gin/*

gin/try_catch.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/try_catch.h"
 
 #include <sstream>
 
 #include "gin/converter.h"
 
 namespace gin {
 
 TryCatch::TryCatch() {
 }
 
 TryCatch::~TryCatch() {
 }
 
 bool TryCatch::HasCaught() {
   return try_catch_.HasCaught();
 }
 
 std::string TryCatch::GetStackTrace() {
   if (!HasCaught()) {
     return "";
   }
 
   std::stringstream ss;
-  v8::Handle<v8::Message> message = try_catch_.Message();
+  v8::Local<v8::Message> message = try_catch_.Message();
   ss << V8ToString(message->Get()) << std::endl
      << V8ToString(message->GetSourceLine()) << std::endl;
 
-  v8::Handle<v8::StackTrace> trace = message->GetStackTrace();
+  v8::Local<v8::StackTrace> trace = message->GetStackTrace();
   if (trace.IsEmpty())
     return ss.str();
 
   int len = trace->GetFrameCount();
   for (int i = 0; i < len; ++i) {
-    v8::Handle<v8::StackFrame> frame = trace->GetFrame(i);
+    v8::Local<v8::StackFrame> frame = trace->GetFrame(i);
     ss << V8ToString(frame->GetScriptName()) << ":"
        << frame->GetLineNumber() << ":"
        << frame->GetColumn() << ": "
        << V8ToString(frame->GetFunctionName())
        << std::endl;
   }
   return ss.str();
 }
 
 }  // namespace gin