Oilpan: put MessageChannel on the heap.

Source/bindings/core/v8/custom/V8MessageChannelCustom.cpp

Index: Source/bindings/core/v8/custom/V8MessageChannelCustom.cpp
diff --git a/Source/bindings/core/v8/custom/V8MessageChannelCustom.cpp b/Source/bindings/core/v8/custom/V8MessageChannelCustom.cpp
index cac66e600ec3af618c93124fbbfd2a6ed1195edc..96c7ecf25d136f449934981f6dc6b4035fdca12c 100644
--- a/Source/bindings/core/v8/custom/V8MessageChannelCustom.cpp
+++ b/Source/bindings/core/v8/custom/V8MessageChannelCustom.cpp
@@ -44,17 +44,17 @@ void V8MessageChannel::constructorCustom(const v8::FunctionCallbackInfo<v8::Valu
 {
     ExecutionContext* context = currentExecutionContext(info.GetIsolate());
 
-    RefPtrWillBeRawPtr<MessageChannel> obj = MessageChannel::create(context);
+    MessageChannel* channel = MessageChannel::create(context);
 
     v8::Local<v8::Object> wrapper = info.Holder();
 
     // Create references from the MessageChannel wrapper to the two
     // MessagePort wrappers to make sure that the MessagePort wrappers
     // stay alive as long as the MessageChannel wrapper is around.
-    V8HiddenValue::setHiddenValue(info.GetIsolate(), wrapper, V8HiddenValue::port1(info.GetIsolate()), toV8(obj->port1(), info.Holder(), info.GetIsolate()));
-    V8HiddenValue::setHiddenValue(info.GetIsolate(), wrapper, V8HiddenValue::port2(info.GetIsolate()), toV8(obj->port2(), info.Holder(), info.GetIsolate()));
+    V8HiddenValue::setHiddenValue(info.GetIsolate(), wrapper, V8HiddenValue::port1(info.GetIsolate()), toV8(channel->port1(), info.Holder(), info.GetIsolate()));
+    V8HiddenValue::setHiddenValue(info.GetIsolate(), wrapper, V8HiddenValue::port2(info.GetIsolate()), toV8(channel->port2(), info.Holder(), info.GetIsolate()));
 
-    V8DOMWrapper::associateObjectWithWrapper(info.GetIsolate(), obj.get(), &wrapperTypeInfo, wrapper);
+    V8DOMWrapper::associateObjectWithWrapper(info.GetIsolate(), channel, &wrapperTypeInfo, wrapper);
     info.GetReturnValue().Set(wrapper);
 }