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Cherry-pick 274575@main (3113660). https://bugs.webkit.org/show_bug.c…
…gi?id=269308 Null pointer dereference in elementHasClassInClosestAncestors https://bugs.webkit.org/show_bug.cgi?id=269308 rdar://122892811 Reviewed by Brent Fulgham. Ensure ancestor is non-null before accessing it. * Source/WebCore/page/Quirks.cpp: (WebCore::elementHasClassInClosestAncestors): Canonical link: https://commits.webkit.org/274575@main Canonical link: https://commits.webkit.org/266719.372@webkitglib/2.42
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