Revert of [Sync] Refactoring polling to be reliable.

sync/internal_api/sync_rollback_manager.cc

 // Copyright 2014 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.
 
 #include "sync/internal_api/sync_rollback_manager.h"
 
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/read_node.h"
 #include "sync/internal_api/public/read_transaction.h"
 #include "sync/internal_api/public/util/syncer_error.h"
@@ skipping 25 matching lines @@
       CHECK(workers_.find(group) == workers_.end());
       workers_[group] = args->workers[i];
     }
 
     rollback_ready_types_ = GetUserShare()->directory->InitialSyncEndedTypes();
     rollback_ready_types_.RetainAll(BackupTypes());
   }
 }
 
 void SyncRollbackManager::StartSyncingNormally(
-    const ModelSafeRoutingInfo& routing_info, base::Time last_poll_time){
+    const ModelSafeRoutingInfo& routing_info){
   if (rollback_ready_types_.Empty()) {
     NotifyRollbackDone();
     return;
   }
 
   std::map<ModelType, syncable::Directory::Metahandles> to_delete;
   {
     WriteTransaction trans(FROM_HERE, GetUserShare());
     syncable::Directory::Metahandles unsynced;
     GetUserShare()->directory->GetUnsyncedMetaHandles(trans.GetWrappedTrans(),
@@ skipping 57 matching lines @@
 }
 
 void SyncRollbackManager::NotifyRollbackDone() {
   SyncProtocolError error;
   error.action = ROLLBACK_DONE;
   FOR_EACH_OBSERVER(SyncManager::Observer, *GetObservers(),
                     OnActionableError(error));
 }
 
 }  // namespace syncer