Remove no longer meaningful upstream: true flag.

This used to direct robolectric tests to /external/robolectric rather than the older/unmaintained /external/robolectric-shadows, that has since been deleted.

Change-Id: If5065b2d25b5e5d8850f50dd4b25bd0ea7e3dd5c
Flag: TEST_ONLY
Test: CI
Bug: 386652866
1 file changed