Simplify DCHECK at IsContainingBlockForCandidate()

Use CanContainOutOfFlowPositionedElement() to simplify a DCHECK
at NGOutOfFlowLayoutPart::IsContainingBlockForCandidate().
The call to CanContainOutOfFlowPositionedElement() is equivalent
to the previous code.

Change-Id: I361e368729dd5231b3cc5dc52492b01ba4336ac3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526321
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825359}

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

@@ -1022,11 +1022,8 @@ bool NGOutOfFlowLayoutPart::IsContainingBlockForCandidate(
   // Candidates whose containing block is inline are always positioned inside
   // closest parent block flow.
   if (candidate.inline_container) {
-    DCHECK(
-        candidate.node.Style().GetPosition() == EPosition::kAbsolute &&
-            candidate.inline_container->CanContainAbsolutePositionObjects() ||
-        (candidate.node.Style().GetPosition() == EPosition::kFixed &&
-         candidate.inline_container->CanContainFixedPositionObjects()));
+    DCHECK(candidate.inline_container->CanContainOutOfFlowPositionedElement(
+        candidate.node.Style().GetPosition()));
     return container_builder_->GetLayoutObject() ==
            candidate.node.GetLayoutBox()->ContainingBlock();
   }