[Sync] Make SMTP always have the dump stack function.

chrome/browser/sync/test/integration/two_client_uss_sync_test.cc

Index: chrome/browser/sync/test/integration/two_client_uss_sync_test.cc
diff --git a/chrome/browser/sync/test/integration/two_client_uss_sync_test.cc b/chrome/browser/sync/test/integration/two_client_uss_sync_test.cc
index 5ef52f81a6b9b0234a2c9ad34d6bdf632ee88ecf..bbc32048e76ec01eb85f7fee2756d7c854d81dcd 100644
--- a/chrome/browser/sync/test/integration/two_client_uss_sync_test.cc
+++ b/chrome/browser/sync/test/integration/two_client_uss_sync_test.cc
@@ -64,7 +64,8 @@ class TestModelTypeSyncBridge : public FakeModelTypeSyncBridge {
   };
 
   TestModelTypeSyncBridge()
-      : FakeModelTypeSyncBridge(base::Bind(&ModelTypeChangeProcessor::Create)) {
+      : FakeModelTypeSyncBridge(base::Bind(&ModelTypeChangeProcessor::Create,
+                                           base::RepeatingClosure())) {
     change_processor()->ModelReadyToSync(db().CreateMetadataBatch());
   }