Revert of Add GrResourceCache2. (patchset #4 of https://codereview.chromium.org/48144...

Revert of Add GrResourceCache2. (patchset #4 of https://codereview.chromium.org/481443002/)

Reason for revert:
Likely caused a leak detected in Chromium after last Skia roll.

Original issue's description:
> Add GrResourceCache2.
>
> Currently it just replaces GrGpu as the owner of the linked list of resources.
>
> Committed: https://skia.googlesource.com/skia/+/94ce9ac8624dbb45656b8f5c992fad9c9ff3ee5f

R=mtklein@google.com, robertphillips@google.com
TBR=mtklein@google.com, robertphillips@google.com
NOTREECHECKS=true
NOTRY=true

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/477323006