Implement /content/ combinator.

Source/core/css/RuleSetTest.cpp

Index: Source/core/css/RuleSetTest.cpp
diff --git a/Source/core/css/RuleSetTest.cpp b/Source/core/css/RuleSetTest.cpp
index 8fd5ec63bba8c0099d2801132daea9591b8bb07d..622ab24c14b3127dad539f6ff8a601c6c2d8f301 100644
--- a/Source/core/css/RuleSetTest.cpp
+++ b/Source/core/css/RuleSetTest.cpp
@@ -123,17 +123,4 @@ TEST(RuleSetTest, findBestRuleSetAndAdd_TagThenAttrThenId)
     ASSERT_EQ(tagStr, rules->at(0).selector().tagQName().localName());
 }
 
-TEST(RuleSetTest, findBestRuleSetAndAdd_DivWithContent)
-{
-    CSSTestHelper helper;
-
-    helper.addCSSRules("div::content { }");
-    RuleSet& ruleSet = helper.ruleSet();
-    AtomicString str("div");
-    const TerminatedArray<RuleData>* rules = ruleSet.tagRules(str);
-    ASSERT_EQ(1u, rules->size());
-    AtomicString valueStr("content");
-    ASSERT_EQ(valueStr, rules->at(0).selector().value());
-}
-
 } // namespace WebCore