Use reference for FillLayer if possible

Source/core/css/resolver/StyleResourceLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. 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 107 matching lines @@
 {
     if (elementStyleResources.pendingImageProperties().isEmpty())
         return;
 
     PendingImagePropertyMap::const_iterator::Keys end = elementStyleResources.pendingImageProperties().end().keys();
     for (PendingImagePropertyMap::const_iterator::Keys it = elementStyleResources.pendingImageProperties().begin().keys(); it != end; ++it) {
         CSSPropertyID currentProperty = *it;
 
         switch (currentProperty) {
         case CSSPropertyBackgroundImage: {
-            for (FillLayer* backgroundLayer = style->accessBackgroundLayers(); backgroundLayer; backgroundLayer = backgroundLayer->next()) {
+            for (FillLayer* backgroundLayer = &style->accessBackgroundLayers(); backgroundLayer; backgroundLayer = backgroundLayer->next()) {
                 if (backgroundLayer->image() && backgroundLayer->image()->isPendingImage())
                     backgroundLayer->setImage(loadPendingImage(toStylePendingImage(backgroundLayer->image()), elementStyleResources.deviceScaleFactor()));
             }
             break;
         }
         case CSSPropertyContent: {
             for (ContentData* contentData = const_cast<ContentData*>(style->contentData()); contentData; contentData = contentData->next()) {
                 if (contentData->isImage()) {
                     StyleImage* image = static_cast<ImageContentData*>(contentData)->image();
                     if (image->isPendingImage()) {
@@ skipping 36 matching lines @@
                 }
             }
             break;
         }
         case CSSPropertyWebkitMaskBoxImageSource: {
             if (style->maskBoxImageSource() && style->maskBoxImageSource()->isPendingImage())
                 style->setMaskBoxImageSource(loadPendingImage(toStylePendingImage(style->maskBoxImageSource()), elementStyleResources.deviceScaleFactor()));
             break;
         }
         case CSSPropertyWebkitMaskImage: {
-            for (FillLayer* maskLayer = style->accessMaskLayers(); maskLayer; maskLayer = maskLayer->next()) {
+            for (FillLayer* maskLayer = &style->accessMaskLayers(); maskLayer; maskLayer = maskLayer->next()) {
                 if (maskLayer->image() && maskLayer->image()->isPendingImage())
                     maskLayer->setImage(loadPendingImage(toStylePendingImage(maskLayer->image()), elementStyleResources.deviceScaleFactor()));
             }
             break;
         }
         case CSSPropertyShapeOutside:
             loadPendingShapeImage(style, style->shapeOutside(), elementStyleResources.deviceScaleFactor());
             break;
         default:
             ASSERT_NOT_REACHED();
         }
     }
 
     elementStyleResources.clearPendingImageProperties();
 }
 
 void StyleResourceLoader::loadPendingResources(RenderStyle* renderStyle, ElementStyleResources& elementStyleResources)
 {
     // Start loading images referenced by this style.
     loadPendingImages(renderStyle, elementStyleResources);
 
     // Start loading the SVG Documents referenced by this style.
     loadPendingSVGDocuments(renderStyle, elementStyleResources);
 }
 
 }