Remove support for pseudo classes in <content select>.

Source/core/testing/InternalSettings.h

Index: Source/core/testing/InternalSettings.h
diff --git a/Source/core/testing/InternalSettings.h b/Source/core/testing/InternalSettings.h
index afdc180e6e3b666c2e5f924af1bbca1e74983b23..85428a9091521e4c708264c17e382ae76f48958b 100644
--- a/Source/core/testing/InternalSettings.h
+++ b/Source/core/testing/InternalSettings.h
@@ -74,7 +74,6 @@ public:
         bool m_imagesEnabled;
         String m_defaultVideoPosterURL;
         bool m_originalLayerSquashingEnabled;
-        bool m_originalPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled;
         bool m_originalImageColorProfilesEnabled;
         ImageAnimationPolicy m_originalImageAnimationPolicy;
         bool m_originalScrollTopLeftInteropEnabled;
@@ -121,7 +120,6 @@ public:
     void setLangAttributeAwareFormControlUIEnabled(bool);
     void setOverlayScrollbarsEnabled(bool);
     void setExperimentalContentSecurityPolicyFeaturesEnabled(bool);
-    void setPseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled(bool);
     void setImageColorProfilesEnabled(bool);
     void setImageAnimationPolicy(const String&, ExceptionState&);
     void setScrollTopLeftInteropEnabled(bool);