Make platform/text to use USING_FAST_MALLOC.

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

Index: third_party/WebKit/Source/platform/text/TextBreakIterator.h
diff --git a/third_party/WebKit/Source/platform/text/TextBreakIterator.h b/third_party/WebKit/Source/platform/text/TextBreakIterator.h
index 72187c6c3cc7f1c2deba1dfcfb85bbf31b531645..b984214d062e7dddd927f168d8d6b7cc27b429c8 100644
--- a/third_party/WebKit/Source/platform/text/TextBreakIterator.h
+++ b/third_party/WebKit/Source/platform/text/TextBreakIterator.h
@@ -57,7 +57,8 @@ enum class LineBreakType {
     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)
@@ -199,7 +200,8 @@ private:
 // 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&);