sync: Remove unused private fields

sync/sessions/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 SYNC_SESSIONS_NUDGE_TRACKER_H_
 #define SYNC_SESSIONS_NUDGE_TRACKER_H_
 
 #include <list>
@@ skipping 141 matching lines @@
 
   // Update the default nudge delay.
   void SetDefaultNudgeDelay(base::TimeDelta nudge_delay);
 
  private:
   typedef std::map<ModelType, DataTypeTracker*> TypeTrackerMap;
 
   TypeTrackerMap type_trackers_;
   STLValueDeleter<TypeTrackerMap> type_tracker_deleter_;
 
-  // Merged updates source.  This should be obsolete, but the server still
-  // relies on it for some heuristics.
-  sync_pb::GetUpdatesCallerInfo::GetUpdatesSource updates_source_;
-
   // Tracks whether or not invalidations are currently enabled.
   bool invalidations_enabled_;
 
   // This flag is set if suspect that some technical malfunction or known bug
   // may have left us with some unserviced invalidations.
   //
   // Keeps track of whether or not we're fully in sync with the invalidation
   // server.  This can be false even if invalidations are enabled and working
   // correctly.  For example, until we get ack-tracking working properly, we
   // won't persist invalidations between restarts, so we may be out of sync when
   // we restart.  The only way to get back into sync is to have invalidations
   // enabled, then complete a sync cycle to make sure we're fully up to date.
   bool invalidations_out_of_sync_;
 
-  size_t num_payloads_per_type_;
-
   base::TimeTicks last_successful_sync_time_;
 
   // A pending update to the current_retry_time_.
   //
   // The GU retry time is specified by a call to SetNextRetryTime, but we don't
   // want that change to take effect right away, since it could happen in the
   // middle of a sync cycle.  We delay the update until the start of the next
   // sync cycle, which is indicated by a call to SetSyncCycleStartTime().
   base::TimeTicks next_retry_time_;
 
@@ skipping 11 matching lines @@
   base::TimeDelta local_refresh_nudge_delay_;
   base::TimeDelta remote_invalidation_nudge_delay_;
 
   DISALLOW_COPY_AND_ASSIGN(NudgeTracker);
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_SESSIONS_NUDGE_TRACKER_H_