Rename default -> initial style and use singletons.

Source/core/layout/style/LayoutStyle.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, 2009, 2010, 2011 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 309 matching lines @@
         noninherited_flags.affectedByFocus = false;
         noninherited_flags.affectedByHover = false;
         noninherited_flags.affectedByActive = false;
         noninherited_flags.affectedByDrag = false;
         noninherited_flags.isLink = false;
     }
 
 private:
     ALWAYS_INLINE LayoutStyle();
 
-    enum DefaultStyleTag {
-        DefaultStyle
+    enum InitialStyleTag {
+        InitialStyle
     };
-    ALWAYS_INLINE explicit LayoutStyle(DefaultStyleTag);
+    ALWAYS_INLINE explicit LayoutStyle(InitialStyleTag);
     ALWAYS_INLINE LayoutStyle(const LayoutStyle&);
 
+    static PassRefPtr<LayoutStyle> createInitialStyle();
+    static inline LayoutStyle* initialStyle()
+    {
+        DEFINE_STATIC_REF(LayoutStyle, s_initialStyle, (LayoutStyle::createInitialStyle()));
+        return s_initialStyle;
+    }
+
 public:
     static PassRefPtr<LayoutStyle> create();
-    static PassRefPtr<LayoutStyle> createDefaultStyle();
     static PassRefPtr<LayoutStyle> createAnonymousStyleWithDisplay(const LayoutStyle& parentStyle, EDisplay);
     static PassRefPtr<LayoutStyle> clone(const LayoutStyle&);
 
     // Computes how the style change should be propagated down the tree.
     static StyleRecalcChange stylePropagationDiff(const LayoutStyle* oldStyle, const LayoutStyle* newStyle);
 
     static ItemPosition resolveAlignment(const LayoutStyle& parentStyle, const LayoutStyle& childStyle, ItemPosition resolvedAutoPositionForLayoutObject);
     static ItemPosition resolveJustification(const LayoutStyle& parentStyle, const LayoutStyle& childStyle, ItemPosition resolvedAutoPositionForLayoutObject);
 
     StyleDifference visualInvalidationDiff(const LayoutStyle&) const;
@@ skipping 1514 matching lines @@
 }
 
 inline bool LayoutStyle::hasPseudoElementStyle() const
 {
     return noninherited_flags.pseudoBits & PSEUDO_ELEMENT_MASK;
 }
 
 } // namespace blink
 
 #endif // LayoutStyle_h