Fix ASan container overflow in HTMLMenuItemElement::defaultEventHandler

third_party/WebKit/Source/core/html/HTMLMenuItemElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMenuItemElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMenuItemElement.cpp b/third_party/WebKit/Source/core/html/HTMLMenuItemElement.cpp
index e397cda6c7e2fd4fa211f5fcf35da5ec8e17c111..eb25dbe661401c079a5cfd28aa7363e86c4f8b7c 100644
--- a/third_party/WebKit/Source/core/html/HTMLMenuItemElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMenuItemElement.cpp
@@ -29,7 +29,7 @@ void HTMLMenuItemElement::defaultEventHandler(Event* event)
                 setAttribute(checkedAttr, "checked");
         } else if (equalIgnoringCase(fastGetAttribute(typeAttr), "radio")) {
             if (Element* parent = parentElement()) {
-                const AtomicString& group = fastGetAttribute(radiogroupAttr);
+                AtomicString group = fastGetAttribute(radiogroupAttr);
                 for (HTMLMenuItemElement& menuItem : Traversal<HTMLMenuItemElement>::childrenOf(*parent)) {
                     if (!menuItem.fastHasAttribute(checkedAttr))
                         continue;