Remove unnecessary includes from dom.

third_party/WebKit/Source/core/dom/custom/CustomElementDefinition.h

 /*
  * Copyright (C) 2012 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 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CustomElementDefinition_h
 #define CustomElementDefinition_h
 
 #include "core/dom/custom/CustomElementDescriptor.h"
 #include "core/dom/custom/CustomElementLifecycleCallbacks.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
 
 namespace blink {
 
 class CustomElementDefinition final : public GarbageCollectedFinalized<CustomElementDefinition> {
 public:
     static RawPtr<CustomElementDefinition> create(const CustomElementDescriptor&, RawPtr<CustomElementLifecycleCallbacks>);
 
     const CustomElementDescriptor& descriptor() const { return m_descriptor; }
     CustomElementLifecycleCallbacks* callbacks() const { return m_callbacks.get(); }
 
     DECLARE_TRACE();
 
 private:
     CustomElementDefinition(const CustomElementDescriptor&, RawPtr<CustomElementLifecycleCallbacks>);
 
     CustomElementDescriptor m_descriptor;
     Member<CustomElementLifecycleCallbacks> m_callbacks;
 };
 
 } // namespace blink
 
 #endif // CustomElementDefinition_h