Remove more oilpan.

sky/engine/core/html/ime/InputMethodContext.h

 /*
  * 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 27 matching lines @@
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExecutionContext;
 class InputMethodController;
 class Node;
 
-class InputMethodContext final : public DummyBase<InputMethodContext>, public EventTargetWithInlineData {
+class InputMethodContext final : public EventTargetWithInlineData {
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(InputMethodContext);
 public:
     static PassOwnPtr<InputMethodContext> create(HTMLElement*);
     virtual ~InputMethodContext();
 
 #if !ENABLE(OILPAN)
     void ref() { m_element->ref(); }
     void deref() { m_element->deref(); }
 #endif
 
     String locale() const;
@@ skipping 26 matching lines @@
     virtual void derefEventTarget() override { deref(); }
 #endif
 
     RawPtr<HTMLElement> m_element;
     Vector<unsigned> m_segments;
 };
 
 } // namespace blink
 
 #endif // InputMethodContext_h