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Revert of Hold the Pepper proxy lock for all Pepper GL calls. (patchset #3 id:40001 of https://codereview.chromium.org/692683003/)

Reason for revert:
causing huge crashes in canary. bug=429446

Original issue's description:
> Hold the Pepper proxy lock for all Pepper GL calls.
>
> BUG=418651
>
> Committed: https://crrev.com/057f7a69dd40c93550b375b4287dba70d719316a
> Cr-Commit-Position: refs/heads/master@{#302303}

TBR=dmichael@chromium.org,dmichael@google.com,penghuang@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=418651

Review URL: https://codereview.chromium.org/698463006

Cr-Commit-Position: refs/heads/master@{#302391}