Revert of Implement /content/ combinator.

Source/core/css/CSSSelector.h

Index: Source/core/css/CSSSelector.h
diff --git a/Source/core/css/CSSSelector.h b/Source/core/css/CSSSelector.h
index 34eba5772adc2e4822e8ad24c740000a4cb33119..5d2845a7541c5fffb052927a42bc4a80d7cbb517 100644
--- a/Source/core/css/CSSSelector.h
+++ b/Source/core/css/CSSSelector.h
@@ -133,7 +133,6 @@ namespace WebCore {
             // replace the following /shadow/ and /shadow-deep/ with the implementation.
             Shadow, // /shadow/ combinator
             ShadowDeep, // /shadow-deep/ combinator
-            ShadowContent // /content/ for shadow styling
         };
 
         enum PseudoType {
@@ -217,6 +216,7 @@ namespace WebCore {
             PseudoPastCue,
             PseudoDistributed,
             PseudoUnresolved,
+            PseudoContent,
             PseudoHost,
             PseudoAncestor
         };
@@ -293,6 +293,7 @@ namespace WebCore {
         bool isSiblingSelector() const;
         bool isAttributeSelector() const;
         bool isDistributedPseudoElement() const;
+        bool isContentPseudoElement() const;
         bool isHostPseudoClass() const;
 
         // FIXME: selectors with no tagHistory() get a relation() of Descendant. It should instead be
@@ -313,7 +314,7 @@ namespace WebCore {
         bool relationIsAffectedByPseudoContent() const { return m_relationIsAffectedByPseudoContent; }
         void setRelationIsAffectedByPseudoContent() { m_relationIsAffectedByPseudoContent = true; }
 
-        unsigned m_relation           : 4; // enum Relation
+        unsigned m_relation           : 3; // enum Relation
         mutable unsigned m_match      : 4; // enum Match
         mutable unsigned m_pseudoType : 8; // PseudoType
 
@@ -423,6 +424,11 @@ inline bool CSSSelector::isDistributedPseudoElement() const
     return m_match == PseudoElement && pseudoType() == PseudoDistributed;
 }
 
+inline bool CSSSelector::isContentPseudoElement() const
+{
+    return m_match == PseudoElement && pseudoType() == PseudoContent;
+}
+
 inline void CSSSelector::setValue(const AtomicString& value)
 {
     ASSERT(m_match != Tag);