Revert of Disable BrowserTest.WindowOpenClose for Mac (patchset #1 id:1 of https://codereview.chromium.org/1093003002/)
Revert of Disable BrowserTest.WindowOpenClose for Mac (patchset #1 id:1 of https://codereview.chromium.org/1093003002/)

Reason for revert:
The Blink problem has been fixed and will roll into Chrome in the next iteration.

Original issue's description:
> Disable BrowserTest.WindowOpenClose for Mac
>
> It's timing out on Mac 10.6 and 10.8 tests, preventing a Blink roll.
>
> TBR=sky@chromium.org,lushnikov@chromium.org
> BUG=478238
>
> Committed: https://crrev.com/64bd184eb5f5e92121318e698fc70d42de2b3f74
> Cr-Commit-Position: refs/heads/master@{#325753}

TBR=sky@chromium.org,lushnikov@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=478238

Review URL: https://codereview.chromium.org/1096393003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#326103}

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