sync: Fix return value in GetAllNodesForType

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index e12ec8f7c236ca49a40fcbcb601500b191550517..9dd795a8c0d1edae70516551361150d9041975c3 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -970,7 +970,7 @@ scoped_ptr<base::ListValue> SyncManagerImpl::GetAllNodesForType(
     // when it doesn't really know which types are enabled or disabled.
     DLOG(WARNING) << "Asked to return debug info for invalid type "
                   << ModelTypeToString(type);
-    return scoped_ptr<base::ListValue>();
+    return scoped_ptr<base::ListValue>(new base::ListValue());
   }
 
   return it->second->GetAllNodes();