Don't add rule features across ::content.

third_party/WebKit/Source/core/css/RuleFeature.h

Index: third_party/WebKit/Source/core/css/RuleFeature.h
diff --git a/third_party/WebKit/Source/core/css/RuleFeature.h b/third_party/WebKit/Source/core/css/RuleFeature.h
index 3711a7d9d4e3b70ef5de63a006ab04c787429307..9b6ea5f0ec296a77178199f239c8f80e20a0d0e0 100644
--- a/third_party/WebKit/Source/core/css/RuleFeature.h
+++ b/third_party/WebKit/Source/core/css/RuleFeature.h
@@ -138,27 +138,19 @@ private:
 
     struct InvalidationSetFeatures {
         DISALLOW_NEW();
-        InvalidationSetFeatures()
-            : maxDirectAdjacentSelectors(UINT_MAX)
-            , customPseudoElement(false)
-            , hasBeforeOrAfter(false)
-            , treeBoundaryCrossing(false)
-            , adjacent(false)
-            , insertionPointCrossing(false)
-            , forceSubtree(false)
-        { }
 
         Vector<AtomicString> classes;
         Vector<AtomicString> attributes;
         AtomicString id;
         AtomicString tagName;
-        unsigned maxDirectAdjacentSelectors;
-        bool customPseudoElement;
-        bool hasBeforeOrAfter;
-        bool treeBoundaryCrossing;
-        bool adjacent;
-        bool insertionPointCrossing;
-        bool forceSubtree;
+        unsigned maxDirectAdjacentSelectors = UINT_MAX;
+        bool customPseudoElement = false;
+        bool hasBeforeOrAfter = false;
+        bool treeBoundaryCrossing = false;
+        bool adjacent = false;
+        bool insertionPointCrossing = false;
+        bool forceSubtree = false;
+        bool contentPseudoCrossing = false;
     };
 
     static bool extractInvalidationSetFeature(const CSSSelector&, InvalidationSetFeatures&);