Let JsonDoubleQuote accept StringPiece

base/json/string_escape.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/json/string_escape.h"
 
 #include <string>
 
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 60 matching lines @@
       }
     }
   }
 
   if (put_in_quotes)
     dst->push_back('"');
 }
 
 }  // namespace
 
-void JsonDoubleQuote(const std::string& str,
+void JsonDoubleQuote(const StringPiece& str,
                      bool put_in_quotes,
                      std::string* dst) {
   JsonDoubleQuoteT(str, put_in_quotes, dst);
 }
 
-std::string GetDoubleQuotedJson(const std::string& str) {
+std::string GetDoubleQuotedJson(const StringPiece& str) {
   std::string dst;
   JsonDoubleQuote(str, true, &dst);
   return dst;
 }
 
-void JsonDoubleQuote(const string16& str,
+void JsonDoubleQuote(const StringPiece16& str,
                      bool put_in_quotes,
                      std::string* dst) {
   JsonDoubleQuoteT(str, put_in_quotes, dst);
 }
 
-std::string GetDoubleQuotedJson(const string16& str) {
+std::string GetDoubleQuotedJson(const StringPiece16& str) {
   std::string dst;
   JsonDoubleQuote(str, true, &dst);
   return dst;
 }
 
 }  // namespace base