Use reference for FillLayer if possible

Source/core/rendering/InlineFlowBox.h

 /*
  * Copyright (C) 2003, 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 281 matching lines @@
     void clearDescendantsHaveSameLineHeightAndBaseline()
     {
         m_descendantsHaveSameLineHeightAndBaseline = false;
         if (parent() && parent()->descendantsHaveSameLineHeightAndBaseline())
             parent()->clearDescendantsHaveSameLineHeightAndBaseline();
     }
 
 private:
     void paintBoxDecorationBackground(PaintInfo&, const LayoutPoint&);
     void paintMask(PaintInfo&, const LayoutPoint&);
-    void paintFillLayers(const PaintInfo&, const Color&, const FillLayer*, const LayoutRect&, CompositeOperator = CompositeSourceOver);
-    void paintFillLayer(const PaintInfo&, const Color&, const FillLayer*, const LayoutRect&, CompositeOperator = CompositeSourceOver);
+    void paintFillLayers(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, CompositeOperator = CompositeSourceOver);
+    void paintFillLayer(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, CompositeOperator = CompositeSourceOver);
     void paintBoxShadow(const PaintInfo&, RenderStyle*, ShadowStyle, const LayoutRect&);
 
     void addBoxShadowVisualOverflow(LayoutRect& logicalVisualOverflow);
     void addBorderOutsetVisualOverflow(LayoutRect& logicalVisualOverflow);
     void addOutlineVisualOverflow(LayoutRect& logicalVisualOverflow);
     void addTextBoxVisualOverflow(InlineTextBox*, GlyphOverflowAndFallbackFontsMap&, LayoutRect& logicalVisualOverflow);
     void addReplacedChildOverflow(const InlineBox*, LayoutRect& logicalLayoutOverflow, LayoutRect& logicalVisualOverflow);
     void constrainToLineTopAndBottomIfNeeded(LayoutRect&) const;
 
     void setLayoutOverflow(const LayoutRect&, const LayoutRect&);
@@ skipping 59 matching lines @@
 }
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::InlineFlowBox*);
 #endif
 
 #endif // InlineFlowBox_h