Break two classes defined in json_value_serializer.cc, .h into separate files.

chrome/test/ui/javascript_test_util.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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 "chrome/test/ui/javascript_test_util.h"
 
-#include "base/json/json_value_serializer.h"
+#include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 bool JsonDictionaryToMap(const std::string& json,
                          std::map<std::string, std::string>* results) {
   DCHECK(results != NULL);
@@ skipping 40 matching lines @@
         return false;
     }
 
     EXPECT_TRUE(succeeded);
     if (succeeded)
       results->insert(std::make_pair(key, result));
   }
 
   return true;
 }