Make platform/text to use USING_FAST_MALLOC.

third_party/WebKit/Source/platform/text/TextBreakIterator.h

 /*
  * Copyright (C) 2006 Lars Knoll <lars@trolltech.com>
  * Copyright (C) 2007, 2011, 2012 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,
@@ skipping 39 matching lines @@
 PLATFORM_EXPORT bool isWordTextBreak(TextBreakIterator*);
 
 const int TextBreakDone = -1;
 
 enum class LineBreakType {
     Normal,
     BreakAll, // word-break:break-all allows breaks between letters/numbers
     KeepAll, // word-break:keep-all doesn't allow breaks between all kind of letters/numbers except some south east asians'.
 };
 
-class PLATFORM_EXPORT LazyLineBreakIterator {
+class PLATFORM_EXPORT LazyLineBreakIterator final {
+    STACK_ALLOCATED();
 public:
     LazyLineBreakIterator()
         : m_iterator(0)
         , m_cachedPriorContext(0)
         , m_cachedPriorContextLength(0)
     {
         resetPriorContext();
     }
 
     LazyLineBreakIterator(String string, const AtomicString& locale = AtomicString())
@@ skipping 121 matching lines @@
     UChar m_priorContext[priorContextCapacity];
     const UChar* m_cachedPriorContext;
     unsigned m_cachedPriorContextLength;
 };
 
 // Iterates over "extended grapheme clusters", as defined in UAX #29.
 // Note that platform implementations may be less sophisticated - e.g. ICU prior to
 // version 4.0 only supports "legacy grapheme clusters".
 // Use this for general text processing, e.g. string truncation.
 
-class PLATFORM_EXPORT NonSharedCharacterBreakIterator {
+class PLATFORM_EXPORT NonSharedCharacterBreakIterator final {
+    STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(NonSharedCharacterBreakIterator);
 public:
     explicit NonSharedCharacterBreakIterator(const String&);
     NonSharedCharacterBreakIterator(const UChar*, unsigned length);
     ~NonSharedCharacterBreakIterator();
 
     int next();
     int current();
 
     bool isBreak(int offset) const;
@@ skipping 39 matching lines @@
 };
 
 // Counts the number of grapheme clusters. A surrogate pair or a sequence
 // of a non-combining character and following combining characters is
 // counted as 1 grapheme cluster.
 PLATFORM_EXPORT unsigned numGraphemeClusters(const String&);
 
 }
 
 #endif