Revert of Revert of Fix the ppapi test for FlashDRM (patchset #1 id:1 of https:/...

Revert of Revert of Fix the ppapi test for FlashDRM (patchset #1 id:1 of https://codereview.chromium.org/632133002/)

Reason for revert:
This CL was not the cause.

Actual fix here: https://codereview.chromium.org/630963003

Original issue's description:
> Revert of Fix the ppapi test for FlashDRM (patchset #1 id:1 of https://codereview.chromium.org/626883002/)
>
> Reason for revert:
> Suspecting this CL broke the following:
>
> https://build.chromium.org/p/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/2456
>
> Original issue's description:
> > Fix the ppapi test for FlashDRM
> >
> > This fixes the FlashDRM ppapi test which was failing because the test was assuming
> > that the "Hmonitor" value would never be returned on Mac, but at some point it
> > was implemented but the test was never changed. This changes the test to assume
> > that a valid Hmonitor value will be returned on Mac (but doesn't actually check
> > what the value is).
> >
> > BUG=419863
> >
> > Committed: https://crrev.com/5a4fc2503ca9d45c28c60723fdc71cba0f7ea968
> > Cr-Commit-Position: refs/heads/master@{#298298}
>
> TBR=bbudge@chromium.org,raymes@chromium.org
> NOTREECHECKS=true
> NOTRY=true
> BUG=419863
>
> Committed: https://crrev.com/886aeccd3824618309ccce5eabb2a70241073bc9
> Cr-Commit-Position: refs/heads/master@{#298316}

TBR=bbudge@chromium.org,raymes@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=419863

Review URL: https://codereview.chromium.org/630323002

Cr-Commit-Position: refs/heads/master@{#298349}