blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/core/page/ScopedPageSuspender.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef ScopedPageSuspender_h
 #define ScopedPageSuspender_h
 
 #include "core/CoreExport.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
-class Page;
-
 class CORE_EXPORT ScopedPageSuspender final {
   WTF_MAKE_NONCOPYABLE(ScopedPageSuspender);
   USING_FAST_MALLOC(ScopedPageSuspender);
 
  public:
   explicit ScopedPageSuspender();
   ~ScopedPageSuspender();
 
   static bool isActive();
 };
 
 }  // namespace blink
 
 #endif  // ScopedPageSuspender_h