Use invalidation set for :empty pseudo changes.

Source/core/css/RuleFeature.cpp

Index: Source/core/css/RuleFeature.cpp
diff --git a/Source/core/css/RuleFeature.cpp b/Source/core/css/RuleFeature.cpp
index 23e821930aa27db742e350dcc2bac6983686346a..84e130f4fae6a40e7a62d0723e2d41685e0c8751 100644
--- a/Source/core/css/RuleFeature.cpp
+++ b/Source/core/css/RuleFeature.cpp
@@ -212,9 +212,15 @@ DescendantInvalidationSet* RuleFeatureSet::invalidationSetForSelector(const CSSS
     if (selector.match() == CSSSelector::Id)
         return &ensureIdInvalidationSet(selector.value());
     if (selector.match() == CSSSelector::PseudoClass) {
-        CSSSelector::PseudoType pseudo = selector.pseudoType();
-        if (pseudo == CSSSelector::PseudoHover || pseudo == CSSSelector::PseudoActive || pseudo == CSSSelector::PseudoFocus)
-            return &ensurePseudoInvalidationSet(pseudo);
+        switch (selector.pseudoType()) {
+        case CSSSelector::PseudoEmpty:
+        case CSSSelector::PseudoHover:
+        case CSSSelector::PseudoActive:
+        case CSSSelector::PseudoFocus:
+            return &ensurePseudoInvalidationSet(selector.pseudoType());
+        default:
+            break;
+        }
     }
     return 0;
 }