sync: Consistently refcount ModelSafeWorkers

chrome/browser/sync/glue/sync_backend_registrar.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/glue/sync_backend_registrar.h"
 
 #include <cstddef>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 245 matching lines @@
   if (!processor)
     return;
 
   // This call just notifies the processor that it can commit; it
   // already buffered any changes it plans to makes so needs no
   // further information.
   processor->CommitChangesFromSyncModel();
 }
 
 void SyncBackendRegistrar::GetWorkers(
-    std::vector<syncer::ModelSafeWorker*>* out) {
+    std::vector<scoped_refptr<syncer::ModelSafeWorker> >* out) {
   base::AutoLock lock(lock_);
   out->clear();
   for (WorkerMap::const_iterator it = workers_.begin();
        it != workers_.end(); ++it) {
     out->push_back(it->second.get());
   }
 }
 
 void SyncBackendRegistrar::GetModelSafeRoutingInfo(
     syncer::ModelSafeRoutingInfo* out) {
@@ skipping 90 matching lines @@
         base::Bind(&SyncBackendRegistrar::OnWorkerUnregistrationDone,
                    base::Unretained(this)));
   }
 }
 
 base::Thread* SyncBackendRegistrar::sync_thread() {
   return sync_thread_.get();
 }
 
 }  // namespace browser_sync