Revert of By default purge resources that haven't been used for 64 flushes (patchset...

Revert of By default purge resources that haven't been used for 64 flushes (patchset #3 id:40001 of https://codereview.chromium.org/1316233003/ )

Reason for revert:
Blocking roll

Original issue's description:
> By default purge resources that haven't been used for 64 flushes
>
> BUG=skia:4258
>
> Committed: https://skia.googlesource.com/skia/+/85047175508a24f43eef49359bed215a2a3bb104
>
> R=robertphillips@google.com
>
> Committed: https://skia.googlesource.com/skia/+/71d0c33068d41878cc3117f3761f49300f6b3d54

TBR=robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4258

Review URL: https://codereview.chromium.org/1316263003