Replace Handle<> with Local in remaining gin/*

Handle is an alias for Local

BUG=424445

Review URL: https://codereview.chromium.org/1112923003

Cr-Commit-Position: refs/heads/master@{#327672}
diff --git a/gin/try_catch.cc b/gin/try_catch.cc
index a44e28e..97e7fe15 100644
--- a/gin/try_catch.cc
+++ b/gin/try_catch.cc
@@ -26,17 +26,17 @@
   }
 
   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() << ": "