sync: Remove ClearUserData command.

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 f6a54cc1b0f24a3af82fd0514ce65847d598cfba..363b93e9e89120a855fe2438fcad78135c1f2223 100644
--- a/sync/engine/sync_scheduler.h
+++ b/sync/engine/sync_scheduler.h
@@ -94,9 +94,6 @@ class SyncScheduler : public sessions::SyncSession::Delegate {
       syncable::ModelTypeSet types,
       sync_pb::GetUpdatesCallerInfo::GetUpdatesSource source);
 
-  // TODO(tim): remove this. crbug.com/131336
-  void ClearUserData();
-
   void CleanupDisabledTypes();
 
   // Change status of notifications in the SyncSessionContext.
@@ -150,9 +147,6 @@ class SyncScheduler : public sessions::SyncSession::Delegate {
       // A nudge task can come from a variety of components needing to force
       // a sync.  The source is inferable from |session.source()|.
       NUDGE,
-      // The user invoked a function in the UI to clear their entire account
-      // and stop syncing (globally).
-      CLEAR_USER_DATA,
       // 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).
@@ -196,8 +190,6 @@ class SyncScheduler : public sessions::SyncSession::Delegate {
   FRIEND_TEST_ALL_PREFIXES(SyncSchedulerWhiteboxTest,
                            SaveNudgeWhileThrottled);
   FRIEND_TEST_ALL_PREFIXES(SyncSchedulerWhiteboxTest,
-                           ContinueClearUserDataUnderAllCircumstances);
-  FRIEND_TEST_ALL_PREFIXES(SyncSchedulerWhiteboxTest,
                            ContinueCanaryJobConfig);
   FRIEND_TEST_ALL_PREFIXES(SyncSchedulerWhiteboxTest,
       ContinueNudgeWhileExponentialBackOff);