[LayoutNG] Fix incorrect DCHECK

Bug: 740993
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: Iec59abf8eef6091655001374be6795aeef87760f
Reviewed-on: https://chromium-review.googlesource.com/1123166
Commit-Queue: Aleks Totic <atotic@chromium.org>
Reviewed-by: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572088}

third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG

@@ -110,7 +110,6 @@ crbug.com/591099 external/wpt/css/CSS2/normal-flow/block-in-inline-remove-006.xh
 crbug.com/591099 external/wpt/css/CSS2/text/white-space-mixed-003.xht [ Pass ]
 crbug.com/591099 external/wpt/css/css-backgrounds/box-shadow-syntax-001.xht [ Failure ]
 crbug.com/591099 external/wpt/css/css-contain/contain-paint-007.html [ Pass ]
-crbug.com/591099 external/wpt/css/css-filter/filtered-inline-is-container.html [ Crash ]
 crbug.com/714962 external/wpt/css/css-fonts/font-features-across-space-1.html [ Pass ]
 crbug.com/714962 external/wpt/css/css-fonts/font-features-across-space-3.html [ Pass ]
 crbug.com/591099 external/wpt/css/css-fonts/font-variant-ligatures-11.html [ Pass ]

third_party/blink/renderer/core/layout/ng/ng_out_of_flow_layout_part.cc

@@ -398,8 +398,10 @@ scoped_refptr<NGLayoutResult> NGOutOfFlowLayoutPart::LayoutDescendant(
 bool NGOutOfFlowLayoutPart::IsContainingBlockForDescendant(
     const NGOutOfFlowPositionedDescendant& descendant) {
   EPosition position = descendant.node.Style().GetPosition();
+
+  // Descendants whose containing block is inline are always positioned
+  // inside closest parent block flow.
   if (descendant.inline_container) {
-    DCHECK(position == EPosition::kAbsolute);
     return true;
   }
   return (contains_absolute_ && position == EPosition::kAbsolute) ||