Support a negation pseudo-class, :not(), in <content select>

Source/core/testing/InternalSettings.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 52 matching lines @@
         EditingBehaviorType m_originalEditingBehavior;
         bool m_originalTextAutosizingEnabled;
         IntSize m_originalTextAutosizingWindowSizeOverride;
         float m_originalAccessibilityFontScaleFactor;
         String m_originalMediaTypeOverride;
         bool m_originalMockScrollbarsEnabled;
         bool m_langAttributeAwareFormControlUIEnabled;
         bool m_imagesEnabled;
         String m_defaultVideoPosterURL;
         bool m_originalLayerSquashingEnabled;
+        bool m_originalPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled;
     };
 
     static PassRefPtrWillBeRawPtr<InternalSettings> create(Page& page)
     {
         return adoptRefWillBeNoop(new InternalSettings(page));
     }
     static InternalSettings* from(Page&);
 
 #if !ENABLE(OILPAN)
     void hostDestroyed() { m_page = nullptr; }
@@ skipping 26 matching lines @@
 
     // FIXME: The following are RuntimeEnabledFeatures and likely
     // cannot be changed after process start. These setters should
     // be removed or moved onto internals.runtimeFlags:
     void setAuthorShadowDOMForAnyElementEnabled(bool);
     void setCSSExclusionsEnabled(bool);
     void setLangAttributeAwareFormControlUIEnabled(bool);
     void setOverlayScrollbarsEnabled(bool);
     void setStyleScopedEnabled(bool);
     void setExperimentalContentSecurityPolicyFeaturesEnabled(bool);
+    void setPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled(bool);
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     explicit InternalSettings(Page&);
 
     Settings* settings() const;
     Page* page() const { return m_page; }
     static const char* supplementName();
 
     RawPtrWillBeWeakMember<Page> m_page;
     Backup m_backup;
 };
 
 } // namespace WebCore
 
 #endif