Revert of By default purge resources that haven't been used for 64 flushes (patchset #2 id:20001 of https://codereview.chromium.org/1316233003/ )

Reason for revert:
Suspect for the failed "webgl_conformance on Intel GPU on Mac" test on 2 DEPS rolls:
https://codereview.chromium.org/1320943002/
https://codereview.chromium.org/1315703003/

Example build: http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_ng/builds/105501

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

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

Review URL: https://codereview.chromium.org/1319053002
1 file changed