Revert "Add genIDs from all contributing elements to GrReducedClip's mask key."

This reverts commit 1354048c8fa885b83e414532c011d710590d6b46.

Reason for revert: tsan/valgrind failures


Original change's description:
> Add genIDs from all contributing elements to GrReducedClip's mask key.
> 
> Change-Id: I3fed124ba3fefd1ef82acdb4ace9531d0c89ad8b
> Reviewed-on: https://skia-review.googlesource.com/138586
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

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

Change-Id: Ia5bc098309cd02baf46f03d8ff17fabbd383481e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/139920
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
11 files changed