Replace Handle<> with Local in remaining gin/*

gin/per_context_data_unittest.cc

Index: gin/per_context_data_unittest.cc
diff --git a/gin/per_context_data_unittest.cc b/gin/per_context_data_unittest.cc
index 4d795871950000d14176724ab83061cafe016e3c..831ad1cb697b5ed088d6832ad64616e61ba223da 100644
--- a/gin/per_context_data_unittest.cc
+++ b/gin/per_context_data_unittest.cc
@@ -18,8 +18,8 @@ typedef V8Test PerContextDataTest;
 TEST_F(PerContextDataTest, LookupAndDestruction) {
   v8::Isolate::Scope isolate_scope(instance_->isolate());
   v8::HandleScope handle_scope(instance_->isolate());
-  v8::Handle<v8::Context> context = v8::Context::New(
-      instance_->isolate(), NULL, v8::Handle<v8::ObjectTemplate>());
+  v8::Local<v8::Context> context = v8::Context::New(
+      instance_->isolate(), NULL, v8::Local<v8::ObjectTemplate>());
   {
     ContextHolder context_holder(instance_->isolate());
     context_holder.SetContext(context);