Revert "Add angle_dx11 back to the manifest"

Now that chromium has been brought up to date, we no longer need this old project.

This reverts commit 72a1bb6dac0d867d645ef54aa3ed654a7ab552db.

Change-Id: I4b25a4729108fe0f925ec98b6bd8e47c625ef581
1 file changed