Revert of Use uint16s for texture coordinates when rendering text. (patchset #5 id:80001 of https://codereview.chromium.org/917373002/)

Reason for revert:
speculative revert for DEPS failures

https://codereview.chromium.org/932973002/

Original issue's description:
> Use uint16s for texture coordinates when rendering text.
>
> Allows us to push more vertices into a given vertex buffer, with
> a slight performance improvement.
>
> Committed: https://skia.googlesource.com/skia/+/059034d252007d0dd86fff5ffdbb53cbcb10d34b

TBR=joshualitt@google.com,robertphillips@google.com,bsalomon@google.com,reed@google.com,djsollen@google.com,jvanverth@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/920333003
10 files changed