Let SyncBackupManager keep backup data in memory until shutdown. Only persist

sync/internal_api/sync_rollback_manager_base_unittest.cc

Index: sync/internal_api/sync_rollback_manager_base_unittest.cc
diff --git a/sync/internal_api/sync_rollback_manager_base_unittest.cc b/sync/internal_api/sync_rollback_manager_base_unittest.cc
index a0866ea8f73e7e849f04bfcfddd1d6064d841e51..1438f7ed23424241ea122f122b8a159222156f84 100644
--- a/sync/internal_api/sync_rollback_manager_base_unittest.cc
+++ b/sync/internal_api/sync_rollback_manager_base_unittest.cc
@@ -25,6 +25,7 @@ class SyncTestRollbackManager : public SyncRollbackManagerBase {
     SyncRollbackManagerBase::InitInternal(
         args->database_location,
         args->internal_components_factory.get(),
+        InternalComponentsFactory::STORAGE_IN_MEMORY,
         args->unrecoverable_error_handler.Pass(),
         args->report_unrecoverable_error_function);
   }
@@ -37,7 +38,9 @@ class SyncRollbackManagerBaseTest : public testing::Test {
     args.database_location = base::FilePath(base::FilePath::kCurrentDirectory);
     args.service_url = GURL("https://example.com/");
     args.internal_components_factory.reset(new TestInternalComponentsFactory(
-        InternalComponentsFactory::Switches(), STORAGE_IN_MEMORY));
+        InternalComponentsFactory::Switches(),
+        InternalComponentsFactory::STORAGE_IN_MEMORY,
+        InternalComponentsFactory::STORAGE_IN_MEMORY));
     manager_.Init(&args);
   }