Replaced PassRefPtr copies with moves.

third_party/WebKit/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 97 matching lines @@
     // Don't generate an image for empty sizes.
     if (size.isEmpty())
         return nullptr;
 
     // Look up the image in our cache.
     return m_images.get(size);
 }
 
 void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)
 {
-    m_images.add(size, image);
+    m_images.add(size, std::move(image));
 }
 
 PassRefPtr<Image> CSSImageGeneratorValue::image(const LayoutObject& layoutObject, const IntSize& size, float zoom)
 {
     switch (getClassType()) {
     case CrossfadeClass:
         return toCSSCrossfadeValue(this)->image(layoutObject, size);
     case LinearGradientClass:
         return toCSSLinearGradientValue(this)->image(layoutObject, size);
     case PaintClass:
@@ skipping 88 matching lines @@
         break;
     case RadialGradientClass:
         toCSSRadialGradientValue(this)->loadSubimages(document);
         break;
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink