Clean up forward declarations in Source/core/html

Source/core/html/shadow/PickerIndicatorElement.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 21 matching lines @@
 #define PickerIndicatorElement_h
 
 #if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
 #include "core/html/HTMLDivElement.h"
 #include "core/html/forms/DateTimeChooser.h"
 #include "core/html/forms/DateTimeChooserClient.h"
 
 namespace blink {
 
 class HTMLInputElement;
-class PagePopup;
 
 class PickerIndicatorElement FINAL : public HTMLDivElement, public DateTimeChooserClient {
 public:
     // PickerIndicatorOwner implementer must call removePickerIndicatorOwner when
     // it doesn't handle event, e.g. at destruction.
     class PickerIndicatorOwner : public WillBeGarbageCollectedMixin {
     public:
         virtual ~PickerIndicatorOwner() { }
         virtual bool isPickerIndicatorOwnerDisabledOrReadOnly() const = 0;
         // FIXME: Remove. Deprecated in favor of double version.
@@ skipping 33 matching lines @@
     RawPtrWillBeMember<PickerIndicatorOwner> m_pickerIndicatorOwner;
     RefPtr<DateTimeChooser> m_chooser;
     bool m_isInOpenPopup;
 };
 
 DEFINE_TYPE_CASTS(PickerIndicatorElement, Element, element, element->isPickerIndicatorElement(), element.isPickerIndicatorElement());
 
 }
 #endif
 #endif