Revert of scale xmin and xmax for FontMetrics (patchset #1 id:1 of https://codereview.chromium.org/685153004/)

Reason for revert:
Experimental revert to see if this is blocking the DEPS roll

Original issue's description:
> scale xmin and xmax for FontMetrics
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/79c276e4fd93d9c9fd57a45bc6929c48e4415b2f

TBR=mtklein@google.com,bungeman@google.com,reed@google.com,reed@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/691033002