async_directory_type_controller_unittest.cc: Remove dead code.

components/sync/driver/async_directory_type_controller_unittest.cc

Index: components/sync/driver/async_directory_type_controller_unittest.cc
diff --git a/components/sync/driver/async_directory_type_controller_unittest.cc b/components/sync/driver/async_directory_type_controller_unittest.cc
index 7d21100eeebfb507546d8e00c7b8f09c7a358bcf..c28c2bbad80ce3150135a15e5505d9bebcbcbb2f 100644
--- a/components/sync/driver/async_directory_type_controller_unittest.cc
+++ b/components/sync/driver/async_directory_type_controller_unittest.cc
@@ -56,10 +56,6 @@ ACTION_P(SignalEvent, event) {
   event->Signal();
 }
 
-ACTION_P(SaveChangeProcessor, scoped_change_processor) {
-  scoped_change_processor->reset(arg2);
-}
-
 class SharedChangeProcessorMock : public SharedChangeProcessor {
  public:
   explicit SharedChangeProcessorMock(ModelType type)