Revert "add knob to turn off fancy SkJumper features"

Revert "add knob to turn off fancy SkJumper features"

This reverts commit 5373609d90d8f84b75718b15f3522f9d2f4226cb.

Reason for revert: doesn't look like we'll need this.

Original change's description:
> add knob to turn off fancy SkJumper features
>
> This is a new public API for testing (layout tests).
>
> Change-Id: I10345231bad373c741b1e9656e546000538121b3
> Reviewed-on: https://skia-review.googlesource.com/17712
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
>

Change-Id: Ieed2576d7fc06528384b7476508610e0e29b894f
Reviewed-on: https://skia-review.googlesource.com/17719
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>