Auto merge of #11606 - kevgs:dom_settable_token_list, r=nox

Removed references to DOMSettableTokenList

<!-- Please describe your changes on the following line: -->
PR to #11578

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11606)
<!-- Reviewable:end -->

components/script/dom/webidls/HTMLAnchorElement.webidl

@@ -14,7 +14,7 @@
 interface HTMLAnchorElement : HTMLElement {
   attribute DOMString target;
   //         attribute DOMString download;
-  //[PutForwards=value] attribute DOMSettableTokenList ping;
+  //         attribute USVString ping;
   //         attribute DOMString rel;
   readonly attribute DOMTokenList relList;
   //         attribute DOMString hreflang;

components/script/dom/webidls/HTMLAreaElement.webidl

@@ -9,7 +9,7 @@ interface HTMLAreaElement : HTMLElement {
   //         attribute DOMString shape;
   //         attribute DOMString target;
   //         attribute DOMString download;
-  //[PutForwards=value] attribute DOMSettableTokenList ping;
+  //         attribute USVString ping;
   //         attribute DOMString rel;
   readonly attribute DOMTokenList relList;
   // hreflang and type are not reflected

components/script/dom/webidls/HTMLElement.webidl

@@ -13,10 +13,7 @@ interface HTMLElement : Element {
 
   // microdata
   //         attribute boolean itemScope;
-  //[PutForwards=value] readonly attribute DOMSettableTokenList itemType;
   //         attribute DOMString itemId;
-  //[PutForwards=value] readonly attribute DOMSettableTokenList itemRef;
-  //[PutForwards=value] readonly attribute DOMSettableTokenList itemProp;
   //readonly attribute HTMLPropertiesCollection properties;
   //         attribute any itemValue; // acts as DOMString on setting
 
@@ -29,7 +26,7 @@ interface HTMLElement : Element {
   //         attribute DOMString accessKey;
   //readonly attribute DOMString accessKeyLabel;
   //         attribute boolean draggable;
-  //[PutForwards=value] readonly attribute DOMSettableTokenList dropzone;
+  //[SameObject, PutForwards=value] readonly attribute DOMTokenList dropzone;
   //         attribute HTMLMenuElement? contextMenu;
   //         attribute boolean spellcheck;
   //void forceSpellCheck();

components/script/dom/webidls/HTMLIFrameElement.webidl

@@ -7,7 +7,6 @@ interface HTMLIFrameElement : HTMLElement {
            attribute DOMString src;
   //         attribute DOMString srcdoc;
   //         attribute DOMString name;
-  //[PutForwards=value] readonly attribute DOMSettableTokenList sandbox;
            attribute DOMString sandbox;
   //         attribute boolean seamless;
   //         attribute boolean allowFullscreen;

components/script/dom/webidls/HTMLLinkElement.webidl

@@ -11,7 +11,7 @@ interface HTMLLinkElement : HTMLElement {
            attribute DOMString media;
            attribute DOMString hreflang;
            attribute DOMString type;
-  //[PutForwards=value] readonly attribute DOMSettableTokenList sizes;
+  // [SameObject, PutForwards=value] readonly attribute DOMTokenList sizes;
 
   // also has obsolete members
 };

components/script/dom/webidls/HTMLOutputElement.webidl

@@ -4,7 +4,7 @@
 
 // https://html.spec.whatwg.org/multipage/#htmloutputelement
 interface HTMLOutputElement : HTMLElement {
-  //[PutForwards=value] readonly attribute DOMSettableTokenList htmlFor;
+  // [SameObject, PutForwards=value] readonly attribute DOMTokenList htmlFor;
   readonly attribute HTMLFormElement? form;
   //         attribute DOMString name;
 

components/script/dom/webidls/HTMLTableCellElement.webidl

@@ -7,7 +7,7 @@
 interface HTMLTableCellElement : HTMLElement {
              attribute unsigned long colSpan;
   //         attribute unsigned long rowSpan;
-  //[PutForwards=value] readonly attribute DOMSettableTokenList headers;
+  //         attribute DOMString headers;
   readonly attribute long cellIndex;
 
   // also has obsolete members

tests/wpt/metadata/dom/interface-objects.html.ini

@@ -3,6 +3,3 @@
   [Should be able to delete DOMStringList.]
     expected: FAIL
 
-  [Should be able to delete DOMSettableTokenList.]
-    expected: FAIL
-