Revert of [Sync] Refactoring polling to be reliable.

sync/test/engine/fake_sync_scheduler.h

 // Copyright (c) 2012 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 fake implementation of the SyncScheduler. If needed, we should add default
 // logic needed for tests (invoking callbacks, etc) here rather than in higher
 // level test classes.
 
 #ifndef SYNC_TEST_ENGINE_FAKE_SYNC_SCHEDULER_H_
 #define SYNC_TEST_ENGINE_FAKE_SYNC_SCHEDULER_H_
 
 #include "base/message_loop/message_loop.h"
 #include "sync/engine/sync_scheduler.h"
 
 namespace syncer {
 
 class FakeSyncScheduler : public SyncScheduler {
  public:
   FakeSyncScheduler();
   ~FakeSyncScheduler() override;
 
-  void Start(Mode mode, base::Time last_poll_time) override;
+  void Start(Mode mode) override;
   void Stop() override;
   void ScheduleLocalNudge(
       ModelTypeSet types,
       const tracked_objects::Location& nudge_location) override;
   void ScheduleLocalRefreshRequest(
       ModelTypeSet types,
       const tracked_objects::Location& nudge_location) override;
   void ScheduleInvalidationNudge(
       syncer::ModelType type,
       scoped_ptr<InvalidationInterface> interface,
@@ skipping 18 matching lines @@
       const std::map<ModelType, base::TimeDelta>& nudge_delays) override;
   void OnReceivedClientInvalidationHintBufferSize(int size) override;
   void OnSyncProtocolError(const SyncProtocolError& error) override;
   void OnReceivedGuRetryDelay(const base::TimeDelta& delay) override;
   void OnReceivedMigrationRequest(ModelTypeSet types) override;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_FAKE_SYNC_SCHEDULER_H_