[Sync] Remove CleanupDisabledTypes command and move purge logic into SyncManager.

sync/engine/sync_scheduler_impl.h

Index: sync/engine/sync_scheduler_impl.h
diff --git a/sync/engine/sync_scheduler_impl.h b/sync/engine/sync_scheduler_impl.h
index 179f900db8407538d860dd67abe02e8a3233ec84..c86588a254a24ee947bb597635dd6fa2a66db506 100644
--- a/sync/engine/sync_scheduler_impl.h
+++ b/sync/engine/sync_scheduler_impl.h
@@ -99,12 +99,8 @@ class SyncSchedulerImpl : public SyncScheduler {
       // a sync.  The source is inferable from |session.source()|.
       NUDGE,
       // Typically used for fetching updates for a subset of the enabled types
-      // during initial sync or reconfiguration.  We don't run all steps of
-      // the sync cycle for these (e.g. CleanupDisabledTypes is skipped).
+      // during initial sync or reconfiguration.
       CONFIGURATION,
-      // The user disabled some types and we have to clean up the data
-      // for those.
-      CLEANUP_DISABLED_TYPES,
     };
     SyncSessionJob();
     SyncSessionJob(SyncSessionJobPurpose purpose, base::TimeTicks start,
@@ -220,10 +216,6 @@ class SyncSchedulerImpl : public SyncScheduler {
   // reset our state.
   void FinishSyncSessionJob(const SyncSessionJob& job);
 
-  // Record important state that might be needed in future syncs, such as which
-  // data types may require cleanup.
-  void UpdateCarryoverSessionState(const SyncSessionJob& old_job);
-
   // Helper to FinishSyncSessionJob to schedule the next sync operation.
   void ScheduleNextSync(const SyncSessionJob& old_job);