blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/core/loader/ProgressTracker.h

 /*
  * Copyright (C) 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 20 matching lines @@
 #include "platform/network/ResourceLoadPriority.h"
 #include "wtf/Allocator.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/Noncopyable.h"
 #include <memory>
 
 namespace blink {
 
 class LocalFrame;
-class Resource;
 class ResourceResponse;
 struct ProgressItem;
 
 // FIXME: This is only used on Android. Android is the only Chrome
 // browser which shows a progress bar during loading.
 // We should find a better way for Android to get this data and remove this!
 class CORE_EXPORT ProgressTracker final
     : public GarbageCollectedFinalized<ProgressTracker> {
   WTF_MAKE_NONCOPYABLE(ProgressTracker);
 
@@ skipping 30 matching lines @@
   double m_lastNotifiedProgressTime;
   bool m_finishedParsing;
   double m_progressValue;
 
   HashMap<unsigned long, std::unique_ptr<ProgressItem>> m_progressItems;
 };
 
 }  // namespace blink
 
 #endif