[Sync] Clean up ProfileSyncService observer events

sync/internal_api/sync_manager_impl.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 "sync/internal_api/sync_manager_impl.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 171 matching lines @@
     ConfigureReason reason,
     ModelTypeSet to_download,
     ModelTypeSet to_purge,
     ModelTypeSet to_journal,
     ModelTypeSet to_unapply,
     const ModelSafeRoutingInfo& new_routing_info,
     const base::Closure& ready_task,
     const base::Closure& retry_task) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!ready_task.is_null());
-  DCHECK(!retry_task.is_null());
   DCHECK(initialized_);
 
   DVLOG(1) << "Configuring -"
            << "\n\t" << "current types: "
            << ModelTypeSetToString(GetRoutingInfoTypes(new_routing_info))
            << "\n\t" << "types to download: "
            << ModelTypeSetToString(to_download)
            << "\n\t" << "types to purge: "
            << ModelTypeSetToString(to_purge)
            << "\n\t" << "types to journal: "
@@ skipping 838 matching lines @@
 bool SyncManagerImpl::HasDirectoryTypeDebugInfoObserver(
     syncer::TypeDebugInfoObserver* observer) {
   return model_type_registry_->HasDirectoryTypeDebugInfoObserver(observer);
 }
 
 void SyncManagerImpl::RequestEmitDebugInfo() {
   model_type_registry_->RequestEmitDebugInfo();
 }
 
 }  // namespace syncer