TestExpectations: do not skip document-user-activation.html as the test seems to pass.

Tested locally and everything is fine.

Bug: 733494
Change-Id: I23f3cde42b14d2461fc94a391c6427d5c2aa9e1d
Reviewed-on: https://chromium-review.googlesource.com/c/1263569
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610670}

third_party/WebKit/LayoutTests/TestExpectations

@@ -2644,8 +2644,6 @@ crbug.com/483653 accessibility/scroll-containers.html [ Skip ]
 crbug.com/491764 http/tests/devtools/service-workers/user-agent-override.js [ Pass Timeout ]
 
 # Fails with leak detector.
-crbug.com/733494 [ Linux ] media/autoplay/document-user-activation.html [ Skip ]
-crbug.com/733494 [ Linux ] virtual/video-surface-layer/media/autoplay/document-user-activation.html [ Skip ]
 crbug.com/769885 [ Linux ] virtual/android/fullscreen/full-screen-frameset.html [ Skip ]