Use implicit conversion to FloatRect to remove overloaded filterSize

Source/platform/graphics/filters/FilterEffect.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google 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 49 matching lines @@
     MapRectForward = 1,
     ClipToFilterRegion = 1 << 1
 };
 
 typedef int DetermineSubregionFlags;
 
 class PLATFORM_EXPORT FilterEffect : public RefCounted<FilterEffect> {
 public:
     virtual ~FilterEffect();
 
-    static bool isFilterSizeValid(const IntRect&);
     static bool isFilterSizeValid(const FloatRect&);
     static float maxFilterArea();
 
     void clearResult();
     void clearResultsRecursive();
 
     ImageBuffer* asImageBuffer();
     PassRefPtr<Uint8ClampedArray> asUnmultipliedImage(const IntRect&);
     PassRefPtr<Uint8ClampedArray> asPremultipliedImage(const IntRect&);
     void copyUnmultipliedImage(Uint8ClampedArray* destination, const IntRect&);
@@ skipping 155 matching lines @@
     // Should the effect clip to its primitive region, or expand to use the combined region of its inputs.
     bool m_clipsToBounds;
 
     ColorSpace m_operatingColorSpace;
     ColorSpace m_resultColorSpace;
 };
 
 } // namespace WebCore
 
 #endif // FilterEffect_h