Introduce a layering in the invalidation component as public and impl

components/invalidation/impl/push_client_channel.h

 // Copyright 2014 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.
 
-#ifndef COMPONENTS_INVALIDATION_PUSH_CLIENT_CHANNEL_H_
-#define COMPONENTS_INVALIDATION_PUSH_CLIENT_CHANNEL_H_
+#ifndef COMPONENTS_INVALIDATION_IMPL_PUSH_CLIENT_CHANNEL_H_
+#define COMPONENTS_INVALIDATION_IMPL_PUSH_CLIENT_CHANNEL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
-#include "components/invalidation/invalidation_export.h"
-#include "components/invalidation/sync_system_resources.h"
+#include "components/invalidation/impl/sync_system_resources.h"
+#include "components/invalidation/public/invalidation_export.h"
 #include "jingle/notifier/listener/push_client_observer.h"
 
 namespace notifier {
 class PushClient;
 }  // namespace notifier
 
 namespace syncer {
 
 // A PushClientChannel is an implementation of NetworkChannel that
 // routes messages through a PushClient.
@@ skipping 56 matching lines @@
   int64 scheduling_hash_;
 
   // This count is saved for displaying statatistics.
   int sent_messages_count_;
 
   DISALLOW_COPY_AND_ASSIGN(PushClientChannel);
 };
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_INVALIDATION_PUSH_CLIENT_CHANNEL_H_
+#endif  // COMPONENTS_INVALIDATION_IMPL_PUSH_CLIENT_CHANNEL_H_