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

Source/core/layout/LayoutBlockFlow.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003-2013 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ skipping 334 matching lines @@
     bool shouldBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_lineBreakToAvoidWidow >= 0; }
     void clearShouldBreakAtLineToAvoidWidow() const;
     int lineBreakToAvoidWidow() const { return m_rareData ? m_rareData->m_lineBreakToAvoidWidow : -1; }
     void setBreakAtLineToAvoidWidow(int);
     void clearDidBreakAtLineToAvoidWidow();
     void setDidBreakAtLineToAvoidWidow();
     bool didBreakAtLineToAvoidWidow() const { return m_rareData && m_rareData->m_didBreakAtLineToAvoidWidow; }
 
 public:
     struct FloatWithRect {
+        ALLOW_ONLY_INLINE_ALLOCATION();
         FloatWithRect(LayoutBox* f)
             : object(f)
             , rect(f->frameRect())
             , everHadLayout(f->everHadLayout())
         {
             rect.expand(f->marginBoxOutsets());
         }
 
         LayoutBox* object;
         LayoutRect rect;
         bool everHadLayout;
     };
 
     class MarginValues {
+        DISALLOW_ALLOCATION();
     public:
         MarginValues(LayoutUnit beforePos, LayoutUnit beforeNeg, LayoutUnit afterPos, LayoutUnit afterNeg)
             : m_positiveMarginBefore(beforePos)
             , m_negativeMarginBefore(beforeNeg)
             , m_positiveMarginAfter(afterPos)
             , m_negativeMarginAfter(afterNeg)
         { }
 
         LayoutUnit positiveMarginBefore() const { return m_positiveMarginBefore; }
         LayoutUnit negativeMarginBefore() const { return m_negativeMarginBefore; }
@@ skipping 164 matching lines @@
 
 // END METHODS DEFINED IN LayoutBlockFlowLine
 
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBlockFlow, isLayoutBlockFlow());
 
 } // namespace blink
 
 #endif // LayoutBlockFlow_h