Revert "Stop suppressing two WebGL-related context loss tests on macOS."

This reverts commit 6d93258fa5f0ff66e72342ca6876c4ee12c36dc7.

Reason for revert: The expected fix did not work. They still flake.

Original change's description:
> Stop suppressing two WebGL-related context loss tests on macOS.
> 
>   ContextLost_WebGLBlockedAfterJSNavigation
>   ContextLost_WebGLUnblockedAfterUserInitiatedReload
> 
> Were both flaking due to the same root cause. We believe that has now been fixed.
> 
> TBR=kbr@chromium.org
> 
> Bug: 900948
> Change-Id: I50598872ba8965a047badb69862defebb49fdaee
> Reviewed-on: https://chromium-review.googlesource.com/c/1423114
> Reviewed-by: Jonathan Ross <jonross@chromium.org>
> Commit-Queue: Jonathan Ross <jonross@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#624427}

TBR=kbr@chromium.org,jonross@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 900948
Change-Id: I455358e186e2c881c808b0879189105eba684d66
Reviewed-on: https://chromium-review.googlesource.com/c/1425377
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624583}
1 file changed