Remove tons of OILPAN.

sky/engine/core/testing/NullExecutionContext.h

 // Copyright 2014 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.
 
 #ifndef NullExecutionContext_h
 #define NullExecutionContext_h
 
 #include "core/dom/ExecutionContext.h"
 #include "core/events/EventQueue.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class NullExecutionContext final : public RefCounted<NullExecutionContext>, public ExecutionContext {
 public:
     NullExecutionContext();
 
     virtual EventQueue* eventQueue() const override { return m_queue.get(); }
 
-    void trace(Visitor* visitor)
-    {
-        visitor->trace(m_queue);
-        ExecutionContext::trace(visitor);
-    }
-
     virtual void reportBlockedScriptExecutionToInspector(const String& directiveText) override { }
 
 #if !ENABLE(OILPAN)
     using RefCounted<NullExecutionContext>::ref;
     using RefCounted<NullExecutionContext>::deref;
 
     virtual void refExecutionContext() override { ref(); }
     virtual void derefExecutionContext() override { deref(); }
 #endif
 
 protected:
     virtual const KURL& virtualURL() const override { return m_dummyURL; }
     virtual KURL virtualCompleteURL(const String&) const override { return m_dummyURL; }
 
 private:
     OwnPtr<EventQueue> m_queue;
 
     KURL m_dummyURL;
 };
 
 } // namespace blink
 
 #endif // NullExecutionContext_h