All selectors in :-webkit-any must have an invalidation set feature.

Source/core/css/RuleFeature.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 112 matching lines @@
     bool foundIdent = false;
     for (const CSSSelector* component = &selector; component; component = component->tagHistory()) {
 
         if (component->match() == CSSSelector::Class || component->match() == CSSSelector::Id
             || (component->match() == CSSSelector::Tag && component->tagQName().localName() != starAtom)
             || component->isAttributeSelector() || component->isCustomPseudoElement()) {
             if (!foundCombinator)
                 foundIdent = true;
         } else if (component->pseudoType() == CSSSelector::PseudoHost || component->pseudoType() == CSSSelector::PseudoAny) {
             if (const CSSSelectorList* selectorList = component->selectorList()) {
+                bool foundUniversal = false;
                 for (const CSSSelector* selector = selectorList->first(); selector; selector = CSSSelectorList::next(*selector)) {
                     InvalidationSetMode hostMode = invalidationSetModeForSelector(*selector);
                     if (hostMode == UseSubtreeStyleChange)
                         return foundCombinator ? UseLocalStyleChange : UseSubtreeStyleChange;
-                    if (!foundCombinator && hostMode == AddFeatures)
-                        foundIdent = true;
+                    if (hostMode == UseLocalStyleChange || component->pseudoType() == CSSSelector::PseudoNot)

[rune, 2014/07/10 21:49:20]

The PseudoNot check sneaked its way in from another patch. Will remove.

[rune, 2014/07/10 21:50:46]

Done.

+                        foundUniversal = true;
                 }
+                if (!foundUniversal && !foundCombinator)
+                    foundIdent = true;
             }
         } else if (!isSkippableComponentForInvalidation(*component)) {
             return foundCombinator ? UseLocalStyleChange : UseSubtreeStyleChange;
         }
         if (component->relation() != CSSSelector::SubSelector)
             foundCombinator = true;
     }
     return foundIdent ? AddFeatures : UseLocalStyleChange;
 }
 
@@ skipping 356 matching lines @@
     visitor->trace(siblingRules);
     visitor->trace(uncommonAttributeRules);
     visitor->trace(m_classInvalidationSets);
     visitor->trace(m_attributeInvalidationSets);
     visitor->trace(m_idInvalidationSets);
     visitor->trace(m_pseudoInvalidationSets);
     visitor->trace(m_styleInvalidator);
 }
 
 } // namespace WebCore