Properly handle initialization failure and following manager shutdown without

sync/internal_api/sync_rollback_manager.cc

 // Copyright 2014 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_rollback_manager.h"
 
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/read_node.h"
 #include "sync/internal_api/public/read_transaction.h"
 #include "sync/internal_api/public/util/syncer_error.h"
@@ skipping 35 matching lines @@
                                 use_ssl, post_factory.Pass(),
                                 workers, extensions_activity, change_delegate,
                                 credentials, invalidator_client_id,
                                 restored_key_for_bootstrapping,
                                 restored_keystore_key_for_bootstrapping,
                                 internal_components_factory, encryptor,
                                 unrecoverable_error_handler.Pass(),
                                 report_unrecoverable_error_function,
                                 cancelation_signal);
 
-  change_delegate_ = change_delegate;
+  if (initialized()) {
+    change_delegate_ = change_delegate;
 
-  for (size_t i = 0; i < workers.size(); ++i) {
-    ModelSafeGroup group = workers[i]->GetModelSafeGroup();
-    CHECK(workers_.find(group) == workers_.end());
-    workers_[group] = workers[i];
+    for (size_t i = 0; i < workers.size(); ++i) {
+      ModelSafeGroup group = workers[i]->GetModelSafeGroup();
+      CHECK(workers_.find(group) == workers_.end());
+      workers_[group] = workers[i];
+    }
+
+    rollback_ready_types_ = GetUserShare()->directory->InitialSyncEndedTypes();
+    rollback_ready_types_.RetainAll(BackupTypes());
   }
-
-  rollback_ready_types_ = GetUserShare()->directory->InitialSyncEndedTypes();
-  rollback_ready_types_.RetainAll(BackupTypes());
 }
 
 void SyncRollbackManager::StartSyncingNormally(
     const ModelSafeRoutingInfo& routing_info){
   if (rollback_ready_types_.Empty()) {
     NotifyRollbackDone();
     return;
   }
 
   std::map<ModelType, syncable::Directory::Metahandles> to_delete;
@@ skipping 61 matching lines @@
 }
 
 void SyncRollbackManager::NotifyRollbackDone() {
   SyncProtocolError error;
   error.action = ROLLBACK_DONE;
   FOR_EACH_OBSERVER(SyncManager::Observer, *GetObservers(),
                     OnActionableError(error));
 }
 
 }  // namespace syncer