include RefCounted.h where needed, only.

third_party/WebKit/Source/core/testing/NullExecutionContext.h

Index: third_party/WebKit/Source/core/testing/NullExecutionContext.h
diff --git a/third_party/WebKit/Source/core/testing/NullExecutionContext.h b/third_party/WebKit/Source/core/testing/NullExecutionContext.h
index 84e0ccead013cf85442cbf66186d508b93dff689..0c27c7c45bb8bcd0f12e3aad472697742bc6edf0 100644
--- a/third_party/WebKit/Source/core/testing/NullExecutionContext.h
+++ b/third_party/WebKit/Source/core/testing/NullExecutionContext.h
@@ -12,7 +12,6 @@
 #include "core/inspector/ConsoleMessage.h"
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
-#include "wtf/RefCounted.h"
 
 namespace blink {
 
@@ -50,14 +49,6 @@ public:
         ExecutionContext::trace(visitor);
     }
 
-#if !ENABLE(OILPAN)
-    using RefCounted<NullExecutionContext>::ref;
-    using RefCounted<NullExecutionContext>::deref;
-
-    void refExecutionContext() override { ref(); }
-    void derefExecutionContext() override { deref(); }
-#endif
-
 protected:
     const KURL& virtualURL() const override { return m_dummyURL; }
     KURL virtualCompleteURL(const String&) const override { return m_dummyURL; }