[css-grid] Enable ietestcenter/css3/grid/grid-column-003.htm again

Remove ietestcenter/css3/grid/grid-column-003.htm from TestExpectations
as we didn't manage to reproduce the leak.
Let's see if the bots detect it again or it was already fixed.

BUG=622915

Change-Id: Ibd03c81d5074c6c73cf78abba3ef0abec07aea36
Reviewed-on: https://chromium-review.googlesource.com/809206Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Manuel Rego Casasnovas <rego@igalia.com>
Cr-Commit-Position: refs/heads/master@{#522144}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1671,7 +1671,6 @@ 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/622915 [ Linux ] ietestcenter/css3/grid/grid-column-003.htm [ Skip ]
 crbug.com/733494 [ Linux ] media/autoplay/document-user-activation.html [ Skip ]
 crbug.com/769885 [ Linux ] virtual/android/fullscreen/full-screen-frameset.html [ Skip ]