Make classes and structures in core/editing fast-allocated.

Source/core/editing/EditingStyle.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 151 matching lines @@
 
     RefPtrWillBeMember<MutableStylePropertySet> m_mutableStyle;
     bool m_isMonospaceFont;
     float m_fontSizeDelta;
 
     friend class HTMLElementEquivalent;
     friend class HTMLAttributeEquivalent;
 };
 
 class StyleChange {
+    DISALLOW_ALLOCATION();
 public:
     StyleChange()
         : m_applyBold(false)
         , m_applyItalic(false)
         , m_applyUnderline(false)
         , m_applyLineThrough(false)
         , m_applySubscript(false)
         , m_applySuperscript(false)
     { }
 
@@ skipping 46 matching lines @@
     String m_applyFontSize;
 };
 
 // FIXME: Remove these functions or make them non-global to discourage using CSSStyleDeclaration directly.
 CSSValueID getIdentifierValue(CSSStyleDeclaration*, CSSPropertyID);
 CSSValueID getIdentifierValue(StylePropertySet*, CSSPropertyID);
 
 } // namespace blink
 
 #endif // EditingStyle_h