Auto merge of #24476 - saschanaz:nonenumerable, r=jdm

Mark @@iterator as nonenumerable

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---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #15497

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- [x] There are tests for these changes

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tests/wpt/metadata/dom/idlharness.window.js.ini

@@ -229,9 +229,6 @@
   [AbortSignal interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
-  [DOMTokenList interface: iterable<DOMString>]
-    expected: FAIL
-
   [Document interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
@@ -487,9 +484,6 @@
   [AbstractRange interface: attribute endOffset]
     expected: FAIL
 
-  [NodeList interface: iterable<Node>]
-    expected: FAIL
-
   [CharacterData interface: operation before([object Object\],[object Object\])]
     expected: FAIL
 

tests/wpt/metadata/fetch/api/idlharness.any.js.ini

@@ -64,9 +64,6 @@
   [Request interface: new Request('about:blank') must inherit property "isReloadNavigation" with the proper type]
     expected: FAIL
 
-  [Headers interface: iterable<ByteString, ByteString>]
-    expected: FAIL
-
   [Request interface: new Request('about:blank') must inherit property "signal" with the proper type]
     expected: FAIL
 
@@ -147,9 +144,6 @@
   [Request interface: new Request('about:blank') must inherit property "isReloadNavigation" with the proper type]
     expected: FAIL
 
-  [Headers interface: iterable<ByteString, ByteString>]
-    expected: FAIL
-
   [Request interface: new Request('about:blank') must inherit property "signal" with the proper type]
     expected: FAIL
 

tests/wpt/metadata/url/idlharness.any.js.ini

@@ -8,9 +8,6 @@
   [URL interface: legacy window alias]
     expected: FAIL
 
-  [URLSearchParams interface: iterable<USVString, USVString>]
-    expected: FAIL
-
 
 [idlharness.any.worker.html]
   [idlharness]
@@ -19,6 +16,3 @@
   [Testing Symbol.iterator property of iterable interface URLSearchParams]
     expected: FAIL
 
-  [URLSearchParams interface: iterable<USVString, USVString>]
-    expected: FAIL
-

tests/wpt/metadata/xhr/idlharness.any.js.ini

@@ -1,26 +1,4 @@
-[idlharness.any.html]
-  [idlharness]
-    expected: FAIL
-
-  [Testing Symbol.iterator property of iterable interface FormData]
-    expected: FAIL
-
-  [FormData interface: iterable<USVString, FormDataEntryValue>]
-    expected: FAIL
-
-
 [idlharness.any.sharedworker.html]
   [idlharness]
     expected: FAIL
 
-
-[idlharness.any.worker.html]
-  [idlharness]
-    expected: FAIL
-
-  [Testing Symbol.iterator property of iterable interface FormData]
-    expected: FAIL
-
-  [FormData interface: iterable<USVString, FormDataEntryValue>]
-    expected: FAIL
-