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

remoting/host/policy_hack/nat_policy_linux.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.
 
 // Most of this code is copied from various classes in
 // src/chrome/browser/policy. In particular, look at
 //
 //   file_based_policy_loader.{h,cc}
 //   config_dir_policy_provider.{h,cc}
 //
 // This is a reduction of the functionality in those classes.
 
 #include <set>
 
 #include "remoting/host/policy_hack/nat_policy.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/files/file_path_watcher.h"
-#include "base/json/json_value_serializer.h"
+#include "base/json/json_file_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop_proxy.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/time.h"
 #include "base/values.h"
 
 namespace remoting {
 namespace policy_hack {
 
@@ skipping 231 matching lines @@
   base::WeakPtrFactory<NatPolicyLinux> weak_factory_;
 };
 
 NatPolicy* NatPolicy::Create(base::MessageLoopProxy* message_loop_proxy) {
   FilePath policy_dir(kPolicyDir);
   return new NatPolicyLinux(message_loop_proxy, policy_dir);
 }
 
 }  // namespace policy_hack
 }  // namespace remoting