[Sync] SyncEngine 1.5: Fix all backend references in PSS.

chrome/browser/sync/sync_startup_tracker.cc

 // 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.
 
 #include "chrome/browser/sync/sync_startup_tracker.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "components/browser_sync/profile_sync_service.h"
 
@@ skipping 43 matching lines @@
     return SYNC_STARTUP_ERROR;
 
   browser_sync::ProfileSyncService* service =
       ProfileSyncServiceFactory::GetForProfile(profile);
 
   // If no service exists or it can't be started, treat as a startup error.
   if (!service || !service->CanSyncStart()) {
     return SYNC_STARTUP_ERROR;
   }
 
-  // If the sync backend has started up, notify the callback.
-  if (service->IsBackendInitialized())
+  // If the sync engine has started up, notify the callback.
+  if (service->IsEngineInitialized())
     return SYNC_STARTUP_COMPLETE;
 
   // If the sync service has some kind of error, report to the user.
   if (service->HasUnrecoverableError())
     return SYNC_STARTUP_ERROR;
 
   // If we have an auth error and sync is not still waiting for new auth tokens
   // to be fetched, exit.
   if (!service->waiting_for_auth() &&
       service->GetAuthError().state() != GoogleServiceAuthError::NONE) {
     return SYNC_STARTUP_ERROR;
   }
 
-  // No error detected yet, but the sync backend hasn't started up yet, so
+  // No error detected yet, but the sync engine hasn't started up yet, so
   // we're in the pending state.
   return SYNC_STARTUP_PENDING;
 }