servo: Merge #6771 - Remove unused allow(unrooted_must_root) attribute (from Ms2ger:unused-attr); r=jdm

Source-Repo: https://github.com/servo/servo
Source-Revision: 78455ec033c6116732a8f43b909093b7d7732779

servo/components/script/dom/htmlinputelement.rs

@@ -158,7 +158,6 @@ pub trait RawLayoutHTMLInputElementHelpers {
 }
 
 impl LayoutHTMLInputElementHelpers for LayoutJS<HTMLInputElement> {
-    #[allow(unrooted_must_root)]
     #[allow(unsafe_code)]
     unsafe fn get_value_for_layout(self) -> String {
         #[allow(unsafe_code)]