GrTessellator: remove 64K vertex limit.

This is some code I cargo-culted in from an another path renderer and
is not necessary since we don't used indexed geometry. I tested
locally up to 64M points in a path, and it seems fine (up to my
patience).

Bug: skia:7952
Change-Id: Id7745cd1ffe905bdd8a7a505174ba083f8ea91ee
Reviewed-on: https://skia-review.googlesource.com/129246
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
1 file changed