Revert 239771 "SyncFS v2: Add re-initialization code for tempora..."

Lightly suspected of causing failures on CrOS:

http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%282%29/builds/9981

> SyncFS v2: Add re-initialization code for temporary service failure case
> 
> Also run SyncEngineInitializer task at high priority.
> 
> BUG=240165
> TEST=manual
> 
> Review URL: https://codereview.chromium.org/110113003

TBR=kinuko@chromium.org

Review URL: https://codereview.chromium.org/111893007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239923 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/sync_file_system/drive_backend/sync_engine.cc

@@ -148,9 +148,6 @@ void SyncEngine::AddFileStatusObserver(FileStatusObserver* observer) {
 void SyncEngine::RegisterOrigin(
     const GURL& origin,
     const SyncStatusCallback& callback) {
-  if (!metadata_database_ && drive_service_->HasRefreshToken())
-    PostInitializeTask();
-
   task_manager_->ScheduleSyncTaskAtPriority(
       scoped_ptr<SyncTask>(new RegisterAppTask(this, origin.host())),
       SyncTaskManager::PRIORITY_HIGH,
@@ -333,9 +330,6 @@ void SyncEngine::NotifyLastOperationStatus(
 }
 
 void SyncEngine::OnNotificationReceived() {
-  if (service_state_ == REMOTE_SERVICE_TEMPORARY_UNAVAILABLE)
-    UpdateServiceState(REMOTE_SERVICE_OK, "Got push notification for Drive.");
-
   should_check_remote_change_ = true;
   MaybeScheduleNextTask();
 }
@@ -443,9 +437,8 @@ void SyncEngine::PostInitializeTask() {
                                 task_runner_.get(),
                                 drive_service_.get(),
                                 base_dir_.Append(kDatabaseName));
-  task_manager_->ScheduleSyncTaskAtPriority(
+  task_manager_->ScheduleSyncTask(
       scoped_ptr<SyncTask>(initializer),
-      SyncTaskManager::PRIORITY_HIGH,
       base::Bind(&SyncEngine::DidInitialize, weak_ptr_factory_.GetWeakPtr(),
                  initializer));
 }