Clean up forward declarations in Source/core/page

Source/core/page/FocusController.h

 /*
  * Copyright (C) 2006, 2007 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "core/page/FocusType.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 struct FocusCandidate;
-class Document;
 class Element;
 class Frame;
 class HTMLFrameOwnerElement;
 class HTMLShadowElement;
-class IntRect;
-class KeyboardEvent;
 class Node;
 class Page;
 class TreeScope;
 
 class FocusNavigationScope {
     STACK_ALLOCATED();
 public:
     Node* rootNode() const;
     Element* owner() const;
     static FocusNavigationScope focusNavigationScopeOf(Node*);
@@ skipping 63 matching lines @@
     RawPtrWillBeMember<Page> m_page;
     RefPtrWillBeMember<Frame> m_focusedFrame;
     bool m_isActive;
     bool m_isFocused;
     bool m_isChangingFocusedFrame;
 };
 
 } // namespace blink
 
 #endif // FocusController_h