Make SelectorChecker::tagMatches internal to the SelectorChecker

Source/core/dom/SelectorQuery.cpp

Index: Source/core/dom/SelectorQuery.cpp
diff --git a/Source/core/dom/SelectorQuery.cpp b/Source/core/dom/SelectorQuery.cpp
index 2dda9c39f1d47402f223fa8c94c97f9f6290d646..6a5d428934d4258c09430f6dfa83f20f63bad1f4 100644
--- a/Source/core/dom/SelectorQuery.cpp
+++ b/Source/core/dom/SelectorQuery.cpp
@@ -179,7 +179,10 @@ template <typename SelectorQueryTrait>
 void SelectorDataList::collectElementsByTagName(ContainerNode& rootNode, const QualifiedName& tagName,  typename SelectorQueryTrait::OutputType& output) const
 {
     for (Element& element : ElementTraversal::descendantsOf(rootNode)) {
-        if (SelectorChecker::tagMatches(element, tagName)) {
+        // querySelector*() doesn't allow namespaces and throws before it gets
+        // here so we can ignore them.
+        ASSERT(tagName.namespaceURI() == starAtom);
+        if (tagName == anyQName() || element.hasLocalName(tagName.localName())) {
             SelectorQueryTrait::appendElement(output, element);
             if (SelectorQueryTrait::shouldOnlyMatchFirstElement)
                 return;