Move document-user-activation.html expectations to LeakExpectations.

This is allowing the test to run and mark it properly as a leak test
problem.

Bug: 733494
Change-Id: I9c4b9276745510482e58ea89dce9c65c596bcba5
Reviewed-on: https://chromium-review.googlesource.com/c/1352619Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611921}

third_party/blink/web_tests/LeakExpectations

@@ -86,6 +86,8 @@ crbug.com/878727 [ Linux ] virtual/threaded/http/tests/devtools/tracing/timeline
 # Sheriff 2018-10-25
 crbug.com/862029 [ Linux ] virtual/threaded/http/tests/devtools/tracing/timeline-misc/timeline-window-filter.js [ Pass Leak ]
 
+crbug.com/733494 [ Linux ] media/autoplay/document-user-activation.html [ Pass Leak ]
+
 ###########################################################################
 # WARNING: Memory leaks must be fixed asap. Sheriff is expected to revert #
 # culprit CLs instead of suppressing the leaks. If you have any question, #

third_party/blink/web_tests/TestExpectations

@@ -2642,11 +2642,8 @@ 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 ]
 
-
 # Temporarily disabled after chromium change
 crbug.com/492511 [ Mac ] fast/text/atsui-negative-spacing-features.html [ Failure ]
 crbug.com/492511 [ Mac ] fast/text/international/arabic-justify.html [ Failure ]