Add JSON-specific escaping, which has different rules from JS escaping.

base/string_escape.h

Index: base/string_escape.h
===================================================================
--- base/string_escape.h	(revision 16481)
+++ base/string_escape.h	(working copy)
@@ -7,29 +7,26 @@
 #ifndef BASE_STRING_ESCAPE_H__
 #define BASE_STRING_ESCAPE_H__
 
+#include <string>
+
 #include "base/string16.h"
 
 namespace string_escape {
 
-// Escape |str| appropriately for a javascript string litereal, _appending_ the
-// result to |dst|. This will create standard escape sequences (\b, \n),
-// hex escape sequences (\x00), and unicode escape sequences (\uXXXX).
+// Escape |str| appropriately for a JSON string litereal, _appending_ the
+// result to |dst|. This will create unicode escape sequences (\uXXXX).
 // If |put_in_quotes| is true, the result will be surrounded in double quotes.
 // The outputted literal, when interpreted by the browser, should result in a
 // javascript string that is identical and the same length as the input |str|.
-void JavascriptDoubleQuote(const string16& str,
-                           bool put_in_quotes,
-                           std::string* dst);
+void JsonDoubleQuote(const std::string& str,
+                     bool put_in_quotes,
+                     std::string* dst);
 
-// Similar to the wide version, but for narrow strings.  It will not use
-// \uXXXX unicode escape sequences.  It will pass non-7bit characters directly
-// into the string unencoded, allowing the browser to interpret the encoding.
-// The outputted literal, when interpreted by the browser, could result in a
-// javascript string of a different length than the input |str|.
-void JavascriptDoubleQuote(const std::string& str,
-                           bool put_in_quotes,
-                           std::string* dst);
+void JsonDoubleQuote(const string16& str,
+                     bool put_in_quotes,
+                     std::string* dst);
 
+
 }  // namespace string_escape
 
 #endif  // BASE_STRING_ESCAPE_H__