Revert of Oilpan: Prepare to make ExecutionContext GarbageCollectedMixin.

Source/bindings/v8/CustomElementConstructorBuilder.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 138 matching lines @@
     ASSERT(!tryCatch.HasCaught());
     ASSERT(m_wrapperType);
     tagName = QualifiedName(nullAtom, localName, namespaceURI);
     return m_wrapperType;
 }
 
 PassRefPtr<CustomElementLifecycleCallbacks> CustomElementConstructorBuilder::createCallbacks()
 {
     ASSERT(!m_prototype.IsEmpty());
 
+    RefPtr<ExecutionContext> executionContext = m_scriptState->executionContext();
+
     v8::TryCatch exceptionCatcher;
     exceptionCatcher.SetVerbose(true);
 
     v8::Isolate* isolate = m_scriptState->isolate();
     v8::Handle<v8::Function> created = retrieveCallback(isolate, "createdCallback");
     v8::Handle<v8::Function> attached = retrieveCallback(isolate, "attachedCallback");
     v8::Handle<v8::Function> detached = retrieveCallback(isolate, "detachedCallback");
     v8::Handle<v8::Function> attributeChanged = retrieveCallback(isolate, "attributeChangedCallback");
 
     m_callbacks = V8CustomElementLifecycleCallbacks::create(m_scriptState.get(), m_prototype, created, attached, detached, attributeChanged);
@@ skipping 131 matching lines @@
 #if ENABLE(OILPAN)
     // FIXME: Oilpan: We don't have RawPtr<Eement> version of
     // v8SetReturnValueFast until Node.idl has WillBeGarbageCollected.
     v8SetReturnValueFast(info, element.get(), document);
 #else
     v8SetReturnValueFast(info, element.release(), document);
 #endif
 }
 
 } // namespace WebCore