Rebaseline fast/borders/border-antialiasing.html

The new result is wrong, more wrong than the old result, but
having it as a failure in test expectations means we do not
catch any regressions. We did not, for instance, catch the
regression that made the test result worse.

TBR=fmalita@chromium.org
BUG=502531,636475

Review-Url: https://codereview.chromium.org/2260193002
Cr-Commit-Position: refs/heads/master@{#413449}

third_party/WebKit/LayoutTests/TestExpectations

@@ -47,8 +47,6 @@ crbug.com/309675 compositing/gestures/gesture-tapHighlight-simple-longPress.html
 crbug.com/484370 [ Win Debug ] svg/custom/gradient-userSpaceOnUse-with-percentage.svg [ Failure ]
 crbug.com/487344 [ Win ] compositing/video/video-controls-layer-creation.html [ Pass Failure ]
 
-crbug.com/502531 fast/borders/border-antialiasing.html [ Failure ]
-
 crbug.com/504613 crbug.com/524248 paint/images/image-backgrounds-not-antialiased.html [ Skip ]
 crbug.com/504613 crbug.com/524248 virtual/spv2/paint/images/image-backgrounds-not-antialiased.html [ Skip ]