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

chrome/browser/themes/browser_theme_pack_unittest.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/browser/themes/browser_theme_pack.h"
 
 #include "base/file_util.h"
+#include "base/json/json_file_value_serializer.h"
 #include "base/json/json_reader.h"
-#include "base/json/json_value_serializer.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
 #include "base/values.h"
 #include "chrome/browser/themes/theme_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/test/test_browser_thread.h"
 #include "grit/theme_resources.h"
 #include "grit/theme_resources_standard.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 403 matching lines @@
 
   // Part 2: Try to read back the data pack that we just wrote to disk.
   {
     scoped_refptr<BrowserThemePack> pack =
         BrowserThemePack::BuildFromDataPack(
             file, "mblmlcbknbnfebdfjnolmcapmdofhmme");
     ASSERT_TRUE(pack.get());
     VerifyStarGazing(pack.get());
   }
 }