Revert of Implement /content/ combinator.

Source/core/css/parser/BisonCSSParser-in.cpp

Index: Source/core/css/parser/BisonCSSParser-in.cpp
diff --git a/Source/core/css/parser/BisonCSSParser-in.cpp b/Source/core/css/parser/BisonCSSParser-in.cpp
index 23987f311bcaa9e955de34ca6c7b9888833feb79..3034a6f41cc3808e7ef4cc3b532b8c67cd87aec7 100644
--- a/Source/core/css/parser/BisonCSSParser-in.cpp
+++ b/Source/core/css/parser/BisonCSSParser-in.cpp
@@ -1921,6 +1921,9 @@ CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithElementName(const Atomic
     if (specifiers->needsCrossingTreeScopeBoundary())
         return rewriteSpecifiersWithElementNameForCustomPseudoElement(tag, elementName, specifiers, tagIsForNamespaceRule);
 
+    if (specifiers->isContentPseudoElement())
+        return rewriteSpecifiersWithElementNameForContentPseudoElement(tag, elementName, specifiers, tagIsForNamespaceRule);
+
     // *:host never matches, so we can't discard the * otherwise we can't tell the
     // difference between *:host and just :host.
     if (tag == anyQName() && !specifiers->hasHostPseudoSelector())
@@ -1963,7 +1966,7 @@ CSSParserSelector* BisonCSSParser::rewriteSpecifiersWithElementNameForContentPse
     CSSParserSelector* history = specifiers;
     while (history->tagHistory()) {
         history = history->tagHistory();
-        if (history->relationIsAffectedByPseudoContent())
+        if (history->isContentPseudoElement() || history->relationIsAffectedByPseudoContent())
             last = history;
     }
 
@@ -2016,11 +2019,19 @@ CSSParserSelector* BisonCSSParser::rewriteSpecifiers(CSSParserSelector* specifie
         newSpecifier->appendTagHistory(CSSSelector::ShadowPseudo, sinkFloatingSelector(specifiers));
         return newSpecifier;
     }
+    if (newSpecifier->isContentPseudoElement()) {
+        newSpecifier->appendTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(specifiers));
+        return newSpecifier;
+    }
     if (specifiers->needsCrossingTreeScopeBoundary()) {
         // Specifiers for unknown pseudo element go right behind it in the chain.
         specifiers->insertTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(newSpecifier), CSSSelector::ShadowPseudo);
         return specifiers;
     }
+    if (specifiers->isContentPseudoElement()) {
+        specifiers->insertTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(newSpecifier), CSSSelector::SubSelector);
+        return specifiers;
+    }
     specifiers->appendTagHistory(CSSSelector::SubSelector, sinkFloatingSelector(newSpecifier));
     return specifiers;
 }