Revert of Minor cleanup in GrTessellatingPathRenderer. (patchset #1 id:1 of https://codereview.chromium.org/1322023002/ )

Reason for revert:
Patch is incorrect -- floating point errors can cause zero-area monotone polys to be skipped, resulting in a smaller vertex count than estimated.

Reproduce as follows:

out/Debug/SampleApp --slide Fuzzer --msaa 4

switch to GPU mode. Result:

../../src/gpu/batches/GrTessellatingPathRenderer.cpp:1500: failed assertion "static_cast<int>(end - verts) == vertexCount"

Original issue's description:
> Minor cleanup in GrTessellatingPathRenderer.
>
> Vertex counts are always exact, so don't bother handling the case
> where they're different. Just assert.
> Rename variables to reflect.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/9389b871c3b0f06bb34626cf9bdbfe0c93779327

TBR=bsalomon@google.com,senorblanco@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1321723006
1 file changed