Revert of Force DM rebuild. (https://codereview.chromium.org/400723002/)

Reason for revert:
asdf

Original issue's description:
> Force DM rebuild.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/8a10de1

R=mtklein@chromium.org
TBR=mtklein@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/399123002
1 file changed