Revert of Broke GrTessellatingPathRenderer's tessellator out into a separate file. (patchset #8 id:240001 of https://codereview.chromium.org/1557083002/ )

Reason for revert:
broke valgrind bot

Original issue's description:
> Broke GrTessellatingPathRenderer's tessellator out into a separate file.
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1557083002
>
> Committed: https://skia.googlesource.com/skia/+/8b05cb8a00bdb82e100f1ba74bf4de4a504cceea

TBR=bsalomon@google.com,joshualitt@chromium.org,senorblanco@chromium.org,ethannicholas@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1570503002
4 files changed