Unskip acid3/numbered-tests.html

Looks like crbug.com/807627 has been fixed by the recent roll of wpt tools,
in which case this test won't be flaky any more.

Bug: 805463
Change-Id: I184560ed406a082c661f313047830d79d5d152d1
Reviewed-on: https://chromium-review.googlesource.com/957223Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542263}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1671,8 +1671,6 @@ crbug.com/803558 external/wpt/websockets/opening-handshake/003-sets-origin.worke
 crbug.com/803200 external/wpt/websockets/cookies/006.html?wss [ Failure ]
 crbug.com/803200 external/wpt/websockets/opening-handshake/005.html?wss [ Pass Failure ]
 
-crbug.com/805463 external/wpt/acid/acid3/numbered-tests.html [ Skip ]
-
 # ====== New tests from wpt-importer added here ======
 crbug.com/626703 [ Mac10.11 ] external/wpt/payment-handler/can-make-payment-event-constructor.https.worker.html [ Timeout ]
 crbug.com/626703 [ Linux Win ] external/wpt/css/css-text/letter-spacing/letter-spacing-control-chars-001.html [ Failure ]