Set orphans and widows to 1 in new multicol test.

The test left orphans / widows at their initial value (2), but did
assume that we could freely break wherever we wanted. Blink honors
orphans and widows requirements inside multicol containers, so set
them to 1, to get the behavior that the test expects.

Bug: 904263
Change-Id: Ia138da5c65b1c5da450441f38e033320bc983a94
Reviewed-on: https://chromium-review.googlesource.com/c/1331389Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607211}

third_party/WebKit/LayoutTests/TestExpectations

@@ -2887,8 +2887,6 @@ crbug.com/893480 external/wpt/infrastructure/testdriver/actions/elementTiming.ht
 crbug.com/893480 external/wpt/infrastructure/testdriver/actions/multiDevice.html [ Failure Timeout ]
 
 # ====== New tests from wpt-importer added here ======
-crbug.com/626703 virtual/layout_ng_experimental/external/wpt/css/css-multicol/multicol-margin-003.html [ Failure ]
-crbug.com/626703 external/wpt/css/css-multicol/multicol-margin-003.html [ Failure ]
 crbug.com/626703 external/wpt/css/filter-effects/filter-grayscale-003.html [ Failure ]
 crbug.com/626703 external/wpt/css/filter-effects/filter-grayscale-002.html [ Failure ]
 crbug.com/626703 external/wpt/css/filter-effects/filter-external-002-test.html [ Failure ]

third_party/WebKit/LayoutTests/external/wpt/css/css-multicol/multicol-margin-003.html

@@ -17,6 +17,8 @@
     column-count: 2;
     column-gap: 0;
     margin-bottom: 0;
+    orphans: 1;
+    widows: 1;
   }
 
   article div:last-child {