Finish autofill session when service dies.

Fixes: 37565347
Test: manual verification (cannot use CTS because test and service runs in the
      same process)

Change-Id: I04e2d4a3587b9b9cf72a06c46291fb3ba6bbc91e

services/autofill/java/com/android/server/autofill/RemoteFillService.java

@@ -123,8 +123,7 @@ final class RemoteFillService implements DeathRecipient {
     }
 
     public void destroy() {
-        mHandler.sendMessage(obtainMessage(
-                RemoteFillService::handleDestroy, this));
+        mHandler.sendMessage(obtainMessage(RemoteFillService::handleDestroy, this));
     }
 
     private void handleDestroy() {

services/autofill/java/com/android/server/autofill/Session.java

@@ -839,7 +839,8 @@ final class Session implements RemoteFillService.FillServiceCallbacks, ViewState
     // FillServiceCallbacks
     @Override
     public void onServiceDied(RemoteFillService service) {
-        // TODO(b/337565347): implement
+        Slog.w(TAG, "removing session because service died");
+        forceRemoveSelfLocked();
     }
 
     // AutoFillUiCallback