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

sync/engine/sync_scheduler.h

Index: sync/engine/sync_scheduler.h
diff --git a/sync/engine/sync_scheduler.h b/sync/engine/sync_scheduler.h
index 0ca2f5db5a14be3d236213750e9489eda6a919f6..e706a8cf2efa0e3d7932b1999a8f607b91b3f54b 100644
--- a/sync/engine/sync_scheduler.h
+++ b/sync/engine/sync_scheduler.h
@@ -116,8 +116,6 @@ class SyncScheduler : public sessions::SyncSession::Delegate {
       const syncer::ModelTypePayloadMap& types_with_payloads,
       const tracked_objects::Location& nudge_location);
 
-  void CleanupDisabledTypes();
-
   // Change status of notifications in the SyncSessionContext.
   void set_notifications_enabled(bool notifications_enabled);
 
@@ -170,12 +168,8 @@ class SyncScheduler : public sessions::SyncSession::Delegate {
       // 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,
@@ -291,10 +285,6 @@ class SyncScheduler : public sessions::SyncSession::Delegate {
   // 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);