Slightly simplify building FillLayer objects

Source/core/rendering/style/FillLayer.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 66 matching lines @@
     EFillRepeat repeatY() const { return static_cast<EFillRepeat>(m_repeatY); }
     CompositeOperator composite() const { return static_cast<CompositeOperator>(m_composite); }
     blink::WebBlendMode blendMode() const { return static_cast<blink::WebBlendMode>(m_blendMode); }
     const LengthSize& sizeLength() const { return m_sizeLength; }
     EFillSizeType sizeType() const { return static_cast<EFillSizeType>(m_sizeType); }
     FillSize size() const { return FillSize(static_cast<EFillSizeType>(m_sizeType), m_sizeLength); }
     EMaskSourceType maskSourceType() const { return static_cast<EMaskSourceType>(m_maskSourceType); }
 
     const FillLayer* next() const { return m_next; }
     FillLayer* next() { return m_next; }
+    FillLayer* ensureNext()
+    {
+        if (!m_next)
+            m_next = new FillLayer(type());
+        return m_next;
+    }
 
     bool isImageSet() const { return m_imageSet; }
     bool isXPositionSet() const { return m_xPosSet; }
     bool isYPositionSet() const { return m_yPosSet; }
     bool isBackgroundXOriginSet() const { return m_backgroundXOriginSet; }
     bool isBackgroundYOriginSet() const { return m_backgroundYOriginSet; }
     bool isAttachmentSet() const { return m_attachmentSet; }
     bool isClipSet() const { return m_clipSet; }
     bool isOriginSet() const { return m_originSet; }
     bool isRepeatXSet() const { return m_repeatXSet; }
@@ skipping 35 matching lines @@
     void clearAttachment() { m_attachmentSet = false; }
     void clearClip() { m_clipSet = false; }
     void clearOrigin() { m_originSet = false; }
     void clearRepeatX() { m_repeatXSet = false; }
     void clearRepeatY() { m_repeatYSet = false; }
     void clearComposite() { m_compositeSet = false; }
     void clearBlendMode() { m_blendModeSet = false; }
     void clearSize() { m_sizeType = SizeNone; }
     void clearMaskSourceType() { m_maskSourceTypeSet = false; }
 
-    void setNext(FillLayer* n) { if (m_next != n) { delete m_next; m_next = n; } }
-
     FillLayer& operator=(const FillLayer& o);
     FillLayer(const FillLayer& o);
 
     bool operator==(const FillLayer& o) const;
     bool operator!=(const FillLayer& o) const
     {
         return !(*this == o);
     }
 
     bool containsImage(StyleImage*) const;
@@ skipping 80 matching lines @@
     unsigned m_maskSourceTypeSet : 1;
 
     unsigned m_type : 1; // EFillLayerType
 
     mutable unsigned m_clipMax : 2; // EFillBox, maximum m_clip value from this to bottom layer
 };
 
 } // namespace blink
 
 #endif // FillLayer_h