Changes how window manager obtains WindowTree from mus

components/mus/public/cpp/lib/in_flight_change.cc

Index: components/mus/public/cpp/lib/in_flight_change.cc
diff --git a/components/mus/public/cpp/lib/in_flight_change.cc b/components/mus/public/cpp/lib/in_flight_change.cc
index 27b4a69968e7d0ddfed2ed1666cf6d8706ca367d..048787423502807135b607572b89e1f4a47d91d2 100644
--- a/components/mus/public/cpp/lib/in_flight_change.cc
+++ b/components/mus/public/cpp/lib/in_flight_change.cc
@@ -51,6 +51,7 @@ void CrashInFlightChange::SetRevertValueFrom(const InFlightChange& change) {
 }
 
 void CrashInFlightChange::ChangeFailed() {
+  DLOG(ERROR) << "changed failed, type=" << static_cast<int>(change_type());
   CHECK(false);
 }