Bug 1916801 [wpt PR 47969] - [wpt] Fix null-handling in equals JS S…

…tring Builtins, a=testonly

Automatic update from web-platform-tests
[wpt] Fix null-handling in `equals` JS String Builtins

Equals specifically allows null inputs. Update the JS API
tests and the polyfill to match, and remove expectations files
now that the `basic` tests pass.

The test changes are mirrored in an upstream PR:
WebAssembly/js-string-builtins#43

Bug: 42204114
Change-Id: I170f7e26e80033844a1d3e95fbe998d5f64f4a47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5836264
Reviewed-by: Rezvan Mahdavi Hezaveh <rezvanchromium.org>
Commit-Queue: Adam Klein <adamkchromium.org>
Cr-Commit-Position: refs/heads/main{#1350946}

--

wpt-commits: f427091001d8e21333c4a7ed1bfa10379f1f767d
wpt-pr: 47969

UltraBlame original commit: b18d279f4aa8fe1f9f1620b57282557fa43fd884

testing/web-platform/tests/wasm/jsapi/js-string/basic.tentative.any.js

@@ -957,6 +957,10 @@ error
 =
 null
 shouldThrow
+"
+shouldThrow
+mismatch
+"
 )
 ;
 if
@@ -1466,6 +1470,13 @@ equals
 a
 a
 )
+a
+!
+=
+=
+null
+&
+&
 !
 isString
 WebAssembly

testing/web-platform/tests/wasm/jsapi/js-string/polyfill.js

@@ -868,11 +868,27 @@ stringB
 =
 >
 {
+if
+(
+stringA
+!
+=
+=
+null
+)
 throwIfNotString
 (
 stringA
 )
 ;
+if
+(
+stringB
+!
+=
+=
+null
+)
 throwIfNotString
 (
 stringB