[Sync] Move sessions/ to engine/cycle/ and rename things to match.

components/sync/engine_impl/cycle/debug_info_getter.h

 // Copyright 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 COMPONENTS_SYNC_SESSIONS_IMPL_DEBUG_INFO_GETTER_H_
-#define COMPONENTS_SYNC_SESSIONS_IMPL_DEBUG_INFO_GETTER_H_
+#ifndef COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DEBUG_INFO_GETTER_H_
+#define COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DEBUG_INFO_GETTER_H_
 
 #include "components/sync/protocol/sync.pb.h"
 
 namespace syncer {
-namespace sessions {
 
 // This is the interface that needs to be implemented by the event listener
 // to communicate the debug info data to the syncer.
 class DebugInfoGetter {
  public:
   // Gets the client debug info. Be sure to clear the info to ensure the data
   // isn't sent multiple times.
   virtual void GetDebugInfo(sync_pb::DebugInfo* debug_info) = 0;
 
   // Clears the debug info.
   virtual void ClearDebugInfo() = 0;
 
   virtual ~DebugInfoGetter() {}
 };
 
-}  // namespace sessions
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_SESSIONS_IMPL_DEBUG_INFO_GETTER_H_
+#endif  // COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_DEBUG_INFO_GETTER_H_