Make platform/text to use USING_FAST_MALLOC.

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

Index: third_party/WebKit/Source/platform/text/SegmentedString.h
diff --git a/third_party/WebKit/Source/platform/text/SegmentedString.h b/third_party/WebKit/Source/platform/text/SegmentedString.h
index ef47beb0c71a4fd10bba05dc2322d4fab610e9e8..211aa93ce826e33371f88620daa1ba46613842f3 100644
--- a/third_party/WebKit/Source/platform/text/SegmentedString.h
+++ b/third_party/WebKit/Source/platform/text/SegmentedString.h
@@ -21,6 +21,7 @@
 #define SegmentedString_h
 
 #include "platform/PlatformExport.h"
+#include "wtf/Allocator.h"
 #include "wtf/Deque.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/TextPosition.h"
@@ -31,6 +32,7 @@ namespace blink {
 class SegmentedString;
 
 class PLATFORM_EXPORT SegmentedSubstring {
+    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 public:
     SegmentedSubstring()
         : m_length(0)
@@ -175,6 +177,7 @@ private:
 };
 
 class PLATFORM_EXPORT SegmentedString {
+    DISALLOW_NEW();
 public:
     SegmentedString()
         : m_currentChar(0)