Port DictionaryValue to use string16 instead of wstring.

base/json_writer.h

Index: base/json_writer.h
===================================================================
--- base/json_writer.h	(revision 10828)
+++ base/json_writer.h	(working copy)
@@ -5,9 +5,8 @@
 #ifndef BASE_JSON_WRITER_H_
 #define BASE_JSON_WRITER_H_
 
-#include <string>
-
 #include "base/basictypes.h"
+#include "base/string16.h"
 
 class Value;
 
@@ -31,7 +30,7 @@
   void BuildJSONString(const Value* const node, int depth);
 
   // Appends a quoted, escaped, version of str to json_string_.
-  void AppendQuotedString(const std::wstring& str);
+  void AppendQuotedString(const string16& str);
 
   // Adds space to json_string_ for the indent level.
   void IndentLine(int depth);
@@ -45,4 +44,3 @@
 };
 
 #endif  // BASE_JSON_WRITER_H_
-