Backed out changeset c6cf679e8f08 (bug 1773237) for causing bc failures on Promise-inl.h. CLOSED TREE

dom/fetch/FetchStreamReader.cpp

@@ -151,11 +151,6 @@ void FetchStreamReader::CloseAndRelease(JSContext* aCx, nsresult aStatus) {
           MOZ_KnownLive(mReader)->Cancel(aCx, errorValue, ignoredError);
       NS_WARNING_ASSERTION(!ignoredError.Failed(),
                            "Failed to cancel stream during close and release");
-      if (ignoredResultPromise) {
-        bool setSettled = ignoredResultPromise->SetSettledPromiseIsHandled();
-        NS_WARNING_ASSERTION(setSettled, "Failed to settle cancel promise");
-        (void)setSettled;
-      }
     }
 
     // We don't want to propagate exceptions during the cleanup.

dom/streams/test/xpcshell/bug-1773237.js

@@ -1,11 +0,0 @@
-// This test fails if there is an unhandled promise rejection
-var stream = new ReadableStream({
-  pull() {
-    return Promise.reject("foobar");
-  },
-});
-var response = new Response(stream);
-var text = response.text().then(
-  () => {},
-  e => {}
-);

dom/streams/test/xpcshell/xpcshell.ini

@@ -19,4 +19,3 @@ skip-if =
   tsan # Causes claim expired errors; see Bug 1770170.
 run-sequentially = very high failure rate in parallel
 [too-big-array-buffer.js]
-[bug-1773237.js]