blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/fetch/ImageResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007 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.
@@ skipping 19 matching lines @@
 #include "platform/geometry/IntSizeHash.h"
 #include "platform/geometry/LayoutSize.h"
 #include "platform/graphics/ImageObserver.h"
 #include "platform/graphics/ImageOrientation.h"
 #include "wtf/HashMap.h"
 #include <memory>
 
 namespace blink {
 
 class FetchRequest;
-class FloatSize;
 class ImageResourceObserver;
 class MemoryCache;
 class ResourceClient;
 class ResourceFetcher;
 class SecurityOrigin;
 
 // ImageResource class represents an image type resource.
 //
 // As for the lifetimes of m_image and m_data, see this document:
 // https://docs.google.com/document/d/1v0yTAZ6wkqX2U_M6BNIGUJpM1s0TIw1VsqpxoL7aciY/edit?usp=sharing
@@ skipping 167 matching lines @@
   // Indicates if this ImageResource is either attempting to load a placeholder
   // image, or is a (possibly broken) placeholder image.
   bool m_isPlaceholder;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(Image);
 
 }  // namespace blink
 
 #endif