Don't add rule features across ::content.

third_party/WebKit/Source/core/css/invalidation/InvalidationSet.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 67 matching lines @@
 
     void setTreeBoundaryCrossing() { m_treeBoundaryCrossing = true; }
     bool treeBoundaryCrossing() const { return m_treeBoundaryCrossing; }
 
     void setInsertionPointCrossing() { m_insertionPointCrossing = true; }
     bool insertionPointCrossing() const { return m_insertionPointCrossing; }
 
     void setCustomPseudoInvalid() { m_customPseudoInvalid = true; }
     bool customPseudoInvalid() const { return m_customPseudoInvalid; }
 
-    bool isEmpty() const { return !m_classes && !m_ids && !m_tagNames && !m_attributes && !m_customPseudoInvalid; }
+    bool isEmpty() const { return !m_classes && !m_ids && !m_tagNames && !m_attributes && !m_customPseudoInvalid && !m_insertionPointCrossing; }
 
     void toTracedValue(TracedValue*) const;
 
 #ifndef NDEBUG
     void show() const;
 #endif
 
     const HashSet<AtomicString>& classSetForTesting() const { ASSERT(m_classes); return *m_classes; }
     const HashSet<AtomicString>& idSetForTesting() const { ASSERT(m_ids); return *m_ids; }
     const HashSet<AtomicString>& tagNameSetForTesting() const { ASSERT(m_tagNames); return *m_tagNames; }
@@ skipping 91 matching lines @@
     InvalidationSetVector descendants;
     InvalidationSetVector siblings;
 };
 
 DEFINE_TYPE_CASTS(DescendantInvalidationSet, InvalidationSet, value, value->isDescendantInvalidationSet(), value.isDescendantInvalidationSet());
 DEFINE_TYPE_CASTS(SiblingInvalidationSet, InvalidationSet, value, value->isSiblingInvalidationSet(), value.isSiblingInvalidationSet());
 
 } // namespace blink
 
 #endif // InvalidationSet_h