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

chrome/common/extensions/extension_manifests_unittest.cc

 // 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/common/extensions/extension.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gtk/gtk.h>
 #endif
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/i18n/rtl.h"
-#include "base/json/json_value_serializer.h"
+#include "base/json/json_file_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_action.h"
@@ skipping 1010 matching lines @@
   EXPECT_EQ("", extension->page_action()->id());
   EXPECT_EQ(0u, extension->page_action()->icon_paths()->size());
   EXPECT_EQ("", extension->page_action()->GetTitle(
       ExtensionAction::kDefaultTabId));
   EXPECT_FALSE(extension->page_action()->HasPopup(
       ExtensionAction::kDefaultTabId));
 
   LoadAndExpectError("page_action_manifest_version_2b.json",
                      errors::kInvalidPageActionPopup);
 }