Use the correct case converter for |localName| and |tagName|

third_party/WebKit/Source/wtf/text/AtomicString.cpp

Index: third_party/WebKit/Source/wtf/text/AtomicString.cpp
diff --git a/third_party/WebKit/Source/wtf/text/AtomicString.cpp b/third_party/WebKit/Source/wtf/text/AtomicString.cpp
index 74acc819a7fbafceb72b356907a64f4c2c5e0fdd..e91194b36fb80bf2ccfab5783b000b8f38787409 100644
--- a/third_party/WebKit/Source/wtf/text/AtomicString.cpp
+++ b/third_party/WebKit/Source/wtf/text/AtomicString.cpp
@@ -87,6 +87,13 @@ AtomicString AtomicString::lowerASCII() const {
   return AtomicString(newImpl.release());
 }
 
+AtomicString AtomicString::upperASCII() const {
+  StringImpl* impl = this->impl();
+  if (UNLIKELY(!impl))
+    return *this;
+  return AtomicString(impl->upperASCII());
+}
+
 template <typename IntegerType>
 static AtomicString integerToAtomicString(IntegerType input) {
   IntegerToStringConverter<IntegerType> converter(input);