Revert of [Sync] Move //components/sync to the syncer namespace. (patchset #5 id:40001 of https://co

chrome/browser/sync/sync_startup_tracker.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_BROWSER_SYNC_SYNC_STARTUP_TRACKER_H_
 #define CHROME_BROWSER_SYNC_SYNC_STARTUP_TRACKER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/sync/driver/sync_service_observer.h"
 
 class Profile;
 
 // SyncStartupTracker provides a centralized way for observers to detect when
 // ProfileSyncService has successfully started up, or when startup has failed
 // due to some kind of error. This code was originally part of SigninTracker
 // but now that sync initialization is no longer a required part of signin,
 // it has been broken out of that class so only those places that care about
 // sync initialization depend on it.
-class SyncStartupTracker : public syncer::SyncServiceObserver {
+class SyncStartupTracker : public sync_driver::SyncServiceObserver {
  public:
   // Observer interface used to notify observers when sync has started up.
   class Observer {
    public:
     virtual ~Observer() {}
 
     virtual void SyncStartupCompleted() = 0;
     virtual void SyncStartupFailed() = 0;
   };
 
   SyncStartupTracker(Profile* profile, Observer* observer);
   ~SyncStartupTracker() override;
 
   enum SyncServiceState {
     // Sync backend is still starting up.
     SYNC_STARTUP_PENDING,
     // An error has been detected that prevents the sync backend from starting
     // up.
     SYNC_STARTUP_ERROR,
     // Sync startup has completed (i.e. ProfileSyncService::IsSyncActive()
     // returns true).
     SYNC_STARTUP_COMPLETE
   };
 
   // Returns the current state of the sync service.
   static SyncServiceState GetSyncServiceState(Profile* profile);
 
-  // syncer::SyncServiceObserver implementation.
+  // sync_driver::SyncServiceObserver implementation.
   void OnStateChanged() override;
 
  private:
   // Checks the current service state and notifies |observer_| if the state
   // has changed. Note that it is expected that the observer will free this
   // object, so callers should not reference this object after making this call.
   void CheckServiceState();
 
   // Profile whose ProfileSyncService we should track.
   Profile* profile_;
 
   // Weak pointer to the observer to notify.
   Observer* observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncStartupTracker);
 };
 
 #endif  // CHROME_BROWSER_SYNC_SYNC_STARTUP_TRACKER_H_