[SyncFS] Rephrase "LowerPriority" to "Demoted" in MetadataDatabase

chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.cc

 // Copyright 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_file_system/drive_backend/remote_to_local_syncer.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/format_macros.h"
@@ skipping 104 matching lines @@
 }
 
 void RemoteToLocalSyncer::RunExclusive(scoped_ptr<SyncTaskToken> token) {
   if (!drive_service() || !metadata_database() || !remote_change_processor()) {
     token->RecordLog("Context not ready.");
     SyncTaskManager::NotifyTaskDone(token.Pass(), SYNC_STATUS_FAILED);
     return;
   }
 
   dirty_tracker_ = make_scoped_ptr(new FileTracker);
-  if (metadata_database()->GetNormalPriorityDirtyTracker(
-          dirty_tracker_.get())) {
+  if (metadata_database()->GetDirtyTracker(dirty_tracker_.get())) {
     token->RecordLog(base::StringPrintf(
         "Start: tracker_id=%" PRId64, dirty_tracker_->tracker_id()));
-    metadata_database()->LowerTrackerPriority(dirty_tracker_->tracker_id());
+    metadata_database()->DemoteTracker(dirty_tracker_->tracker_id());
     ResolveRemoteChange(token.Pass());
     return;
   }
 
   token->RecordLog("Nothing to do.");
   SyncTaskManager::NotifyTaskDone(token.Pass(), SYNC_STATUS_NO_CHANGE_TO_SYNC);
 }
 
 void RemoteToLocalSyncer::ResolveRemoteChange(scoped_ptr<SyncTaskToken> token) {
   DCHECK(dirty_tracker_);
@@ skipping 623 matching lines @@
 
 SyncStatusCallback RemoteToLocalSyncer::SyncCompletedCallback(
     scoped_ptr<SyncTaskToken> token) {
   return base::Bind(&RemoteToLocalSyncer::SyncCompleted,
                     weak_ptr_factory_.GetWeakPtr(),
                     base::Passed(&token));
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system