Remove unnecessary includes from dom.

third_party/WebKit/Source/core/dom/custom/CustomElementScheduler.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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CustomElementScheduler_h
 #define CustomElementScheduler_h
 
 #include "core/dom/custom/CustomElementCallbackQueue.h"
 #include "core/dom/custom/CustomElementLifecycleCallbacks.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 class CustomElementDescriptor;
 class CustomElementMicrotaskImportStep;
 class CustomElementMicrotaskStep;
 class CustomElementRegistrationContext;
 class HTMLImportChild;
 
@@ skipping 11 matching lines @@
 
 private:
     CustomElementScheduler() { }
 
     static void enqueueMicrotaskStep(Document&, RawPtr<CustomElementMicrotaskStep>, bool importIsSync = true);
 };
 
 } // namespace blink
 
 #endif // CustomElementScheduler_h