Revert "Add native caching of uniquely keyed GrTextureProxies"

This reverts commit d4f100dad90ed5beb1b614464d8c4fcb22c0a993.

Reason for revert: ASAN

Original change's description:
> Add native caching of uniquely keyed GrTextureProxies
> 
> Change-Id: I303fe025b7856b8d681a2d35b416c015bd468e1d
> Reviewed-on: https://skia-review.googlesource.com/48300
> Commit-Queue: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

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

Change-Id: I7bbf549d4855ce6d985867c3880eef80080bd3d1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/49442
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
18 files changed