[Sync] Remove backend unrecoverable error handler

chrome/browser/sync/profile_sync_service.cc

 // 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.
 
 #include "chrome/browser/sync/profile_sync_service.h"
 
 #include <cstddef>
 #include <map>
 #include <vector>
 
@@ skipping 507 matching lines @@
   }
 
   SyncCredentials credentials = GetCredentials();
 
   scoped_refptr<net::URLRequestContextGetter> request_context_getter(
       profile_->GetRequestContext());
 
   if (backend_mode_ == SYNC && delete_stale_data)
     ClearStaleErrors();
 
-  scoped_ptr<syncer::UnrecoverableErrorHandler>
-      backend_unrecoverable_error_handler(
-          new browser_sync::BackendUnrecoverableErrorHandler(
-              MakeWeakHandle(weak_factory_.GetWeakPtr())));
-
   backend_->Initialize(this, sync_thread_.Pass(), GetJsEventHandler(),
                        sync_service_url_, credentials, delete_stale_data,
                        scoped_ptr<syncer::SyncManagerFactory>(
                            new syncer::SyncManagerFactory(GetManagerType()))
                            .Pass(),
-                       backend_unrecoverable_error_handler.Pass(),
+                       MakeWeakHandle(weak_factory_.GetWeakPtr()),
                        base::Bind(browser_sync::ChromeReportUnrecoverableError),
                        network_resources_.get(), saved_nigori_state_.Pass());
 }
 
 bool ProfileSyncService::IsEncryptedDatatypeEnabled() const {
   if (encryption_pending())
     return true;
   const syncer::ModelTypeSet preferred_types = GetPreferredDataTypes();
   const syncer::ModelTypeSet encrypted_types = GetEncryptedDataTypes();
   DCHECK(encrypted_types.Has(syncer::PASSWORDS));
@@ skipping 2172 matching lines @@
     } else {
       UMA_HISTOGRAM_COUNTS("Sync.MemoryPressureWarningBeforeCleanShutdown",
                            warning_received);
     }
   }
   sync_prefs_.SetMemoryPressureWarningCount(0);
   // Will set to true during a clean shutdown, so crash or something else will
   // remain this as false.
   sync_prefs_.SetCleanShutdown(false);
 }