Make Document.createAttribute lowercase the name

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 116247e4c2fc00350ce0e72da6c5148563fbbfff..0a184161d36a93769c999e0bd674ffd71699bc72 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -5014,10 +5014,8 @@ Document* Document::contextDocument() {
 
 Attr* Document::createAttribute(const AtomicString& name,
                                 ExceptionState& exceptionState) {
-  if (isHTMLDocument() && name != name.lower())
-    UseCounter::count(*this,
-                      UseCounter::HTMLDocumentCreateAttributeNameNotLowercase);
-  return createAttributeNS(nullAtom, name, exceptionState, true);
+  return createAttributeNS(nullAtom, convertLocalName(name), exceptionState,
+                           true);
 }
 
 Attr* Document::createAttributeNS(const AtomicString& namespaceURI,