[Sync] Move //sync to //components/sync.

components/sync/engine_impl/nudge_source.h

 // 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.
 
-#ifndef SYNC_ENGINE_NUDGE_SOURCE_H_
-#define SYNC_ENGINE_NUDGE_SOURCE_H_
+#ifndef COMPONENTS_SYNC_ENGINE_IMPL_NUDGE_SOURCE_H_
+#define COMPONENTS_SYNC_ENGINE_IMPL_NUDGE_SOURCE_H_
 
 namespace syncer {
 
 enum NudgeSource {
   NUDGE_SOURCE_UNKNOWN = 0,
   // We received an invalidation message and are nudging to check for updates.
   NUDGE_SOURCE_NOTIFICATION,
   // A local change occurred (e.g. bookmark moved).
   NUDGE_SOURCE_LOCAL,
   // A local event is triggering an optimistic datatype refresh.
   NUDGE_SOURCE_LOCAL_REFRESH,
 };
 
 const char* GetNudgeSourceString(NudgeSource nudge_source);
 
 }  // namespace syncer
 
-#endif  // SYNC_ENGINE_NUDGE_SOURCE_H_
+#endif  // COMPONENTS_SYNC_ENGINE_IMPL_NUDGE_SOURCE_H_