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

components/sync/model_impl/shared_model_type_processor_unittest.cc

Index: components/sync/model_impl/shared_model_type_processor_unittest.cc
diff --git a/components/sync/model_impl/shared_model_type_processor_unittest.cc b/components/sync/model_impl/shared_model_type_processor_unittest.cc
index a624904ad0859f45c3466da9cff6c368db9f9c41..728758fbe3dd342e0f3b72b8cd7057a3cae2d3c3 100644
--- a/components/sync/model_impl/shared_model_type_processor_unittest.cc
+++ b/components/sync/model_impl/shared_model_type_processor_unittest.cc
@@ -61,8 +61,8 @@ std::unique_ptr<EntityData> GenerateEntityData(const std::string& key,
 class TestModelTypeSyncBridge : public FakeModelTypeSyncBridge {
  public:
   TestModelTypeSyncBridge()
-      : FakeModelTypeSyncBridge(base::Bind(&ModelTypeChangeProcessor::Create)) {
-  }
+      : FakeModelTypeSyncBridge(base::Bind(&ModelTypeChangeProcessor::Create,
+                                           base::RepeatingClosure())) {}
 
   explicit TestModelTypeSyncBridge(
       std::unique_ptr<TestModelTypeSyncBridge> other)