Revert "Add isTextureable parameter to GrContextThreadSafeProxy::createCharacterization"

This reverts commit 87685ba492a520eaeb2801e28e83d34cfa84ff84.

Reason for revert: Macs

Original change's description:
> Add isTextureable parameter to GrContextThreadSafeProxy::createCharacterization
> 
> Change-Id: I08d263490982a7d5c1e48a5b31acca25405ab09a
> Reviewed-on: https://skia-review.googlesource.com/c/188628
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: I6f912f587e823b44c3747937619251d05b610fea
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/188860
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
6 files changed