Revert "Specialize SkRectanzier to SkRectanizerSkyline"

This reverts commit 77e1f84a84a7d9dd4beae2e7c83ce63f00500cc2.

Reason for revert: breaking google3 roll?

Original change's description:
> Specialize SkRectanzier to SkRectanizerSkyline
> 
> It looks like the pow2 rectanizer has never been used. Remove
> the unneeded abstraction for rectanizer everywhere.
> 
> Change-Id: Iba33f1c6faf37201d03928ce8409751c212480a0
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/265983
> Commit-Queue: Herb Derby <herb@google.com>
> Reviewed-by: Mike Klein <mtklein@google.com>

TBR=mtklein@google.com,herb@google.com

Change-Id: I2573534f3ea95c98d089f9c19b027564e77015db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/266116
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
12 files changed