HashTraits<RefPtr<P> >::PeekType should be raw pointer for better performance

Source/core/css/CSSImageGeneratorValue.cpp

 /*
  * Copyright (C) 2008 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 94 matching lines @@
             removeClient(renderer);
             addClient(renderer, size);
         }
     }
 
     // Don't generate an image for empty sizes.
     if (size.isEmpty())
         return 0;
 
     // Look up the image in our cache.
-    return m_images.get(size).get();
+    return m_images.get(size);
 }
 
 void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)
 {
     m_images.add(size, image);
 }
 
 void CSSImageGeneratorValue::reportBaseClassMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
@@ skipping 101 matching lines @@
         break;
     case RadialGradientClass:
         static_cast<CSSRadialGradientValue*>(this)->loadSubimages(cachedResourceLoader);
         break;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace WebCore