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

components/sync/engine_impl/cycle/nudge_tracker.h

 // Copyright 2013 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.
 //
 // A class to track the outstanding work required to bring the client back into
 // sync with the server.
-#ifndef COMPONENTS_SYNC_SESSIONS_IMPL_NUDGE_TRACKER_H_
-#define COMPONENTS_SYNC_SESSIONS_IMPL_NUDGE_TRACKER_H_
+#ifndef COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_NUDGE_TRACKER_H_
+#define COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_NUDGE_TRACKER_H_
 
 #include <stddef.h>
 
 #include <list>
 #include <map>
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "components/sync/base/invalidation_interface.h"
 #include "components/sync/base/model_type.h"
+#include "components/sync/engine_impl/cycle/data_type_tracker.h"
 #include "components/sync/protocol/sync.pb.h"
-#include "components/sync/sessions_impl/data_type_tracker.h"
 
 namespace syncer {
 
 class ObjectIdInvalidationMap;
 
-namespace sessions {
-
 class NudgeTracker {
  public:
   static size_t kDefaultMaxPayloadsPerType;
 
   NudgeTracker();
   ~NudgeTracker();
 
   // Returns true if there is a good reason for performing a sync cycle.
   // This does not take into account whether or not this is a good *time* to
   // perform a sync cycle; that's the scheduler's job.
@@ skipping 156 matching lines @@
   base::TimeTicks sync_cycle_start_time_;
 
   // Nudge delays for various events.
   base::TimeDelta minimum_local_nudge_delay_;
   base::TimeDelta local_refresh_nudge_delay_;
   base::TimeDelta remote_invalidation_nudge_delay_;
 
   DISALLOW_COPY_AND_ASSIGN(NudgeTracker);
 };
 
-}  // namespace sessions
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_SESSIONS_IMPL_NUDGE_TRACKER_H_
+#endif  // COMPONENTS_SYNC_ENGINE_IMPL_CYCLE_NUDGE_TRACKER_H_