Make blink classes and structures in core/css fast-allocated

Source/core/css/FontSize.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef FontSize_h
 #define FontSize_h
 
 #include "core/CSSValueKeywords.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class Document;
 
 enum ESmartMinimumForFontSize { DoNotUseSmartMinimumForFontSize, UseSmartMinimumForFontFize };
 
 class FontSize {
-private:
-    FontSize()
-    {
-    }
-
+    STATIC_ONLY(FontSize);
 public:
     static float getComputedSizeFromSpecifiedSize(const Document*, float zoomFactor, bool isAbsoluteSize, float specifiedSize, ESmartMinimumForFontSize = UseSmartMinimumForFontFize);
 
     // Given a CSS keyword in the range (xx-small to -webkit-xxx-large), this function returns
     // values from '1' to '8'.
     static unsigned keywordSize(CSSValueID valueID)
     {
         ASSERT(valueID >= CSSValueXxSmall && valueID <= CSSValueWebkitXxxLarge);
         return valueID - CSSValueXxSmall + 1;
     }
 
     static unsigned initialKeywordSize() { return 4; } // CSSValueMedium
 
     // Given a keyword size in the range (1 to 8), this function will return
     // the correct font size scaled relative to the user's default (4).
     static float fontSizeForKeyword(const Document*, unsigned keyword, bool isMonospace);
 
     // Given a font size in pixel, this function will return legacy font size between 1 and 7.
     static int legacyFontSize(const Document*, int pixelFontSize, bool isMonospace);
 };
 
 } // namespace blink
 
 #endif // FontSize_h