Remove unnecessary includes from dom.

third_party/WebKit/Source/core/dom/custom/CustomElementMicrotaskResolutionStep.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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
  * (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 CustomElementMicrotaskResolutionStep_h
 #define CustomElementMicrotaskResolutionStep_h
 
 #include "core/dom/custom/CustomElementDescriptor.h"
 #include "core/dom/custom/CustomElementMicrotaskStep.h"
 #include "platform/heap/Handle.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefPtr.h"
 
 namespace blink {
 
 class CustomElementRegistrationContext;
 class Element;
 
 class CustomElementMicrotaskResolutionStep final : public CustomElementMicrotaskStep {
 public:
     static RawPtr<CustomElementMicrotaskResolutionStep> create(RawPtr<CustomElementRegistrationContext>, RawPtr<Element>, const CustomElementDescriptor&);
 
@@ skipping 11 matching lines @@
 #endif
 
     Member<CustomElementRegistrationContext> m_context;
     Member<Element> m_element;
     CustomElementDescriptor m_descriptor;
 };
 
 } // namespace blink
 
 #endif // CustomElementMicrotaskResolutionStep_h