Revert "Reapply "ReadableStream should be cancelled on aborting fetch streaming upload""

This reverts commit 9b6dfd300f3e867054f36c067d4db6d2f055e195.

Reason for revert: ci failure:
https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20Tests%20(dbg)(1)/119114/test-results?sortby=&groupby=

Original change's description:
> Reapply "ReadableStream should be cancelled on aborting fetch streaming upload"
>
> This reverts commit 80d8034488638d62c98d39f1e3b0d229f0f95948.
>
> This CL reapplies the CL fixing the ci test failure:
> https://ci.chromium.org/ui/p/chromium/builders/findit/test-single-revision/15511/overview
> (see the diff from Patchset#1)
>
> Fixed: 40071725
> Change-Id: Iff847a32a5d5cc0da01343e97bc0f63eab4780cd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5348005
> Reviewed-by: Adam Rice <ricea@chromium.org>
> Commit-Queue: Adam Rice <ricea@chromium.org>
> Auto-Submit: Yoichi Osato <yoichio@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1270046}

Bug: 40071725
Fixed: 328787040
Change-Id: I8a777dd4896fa95bf7e30346f285ec511c555617
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5358674
Commit-Queue: Adam Rice <ricea@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Adam Rice <ricea@chromium.org>
Auto-Submit: Yoichi Osato <yoichio@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1270818}
diff --git a/fetch/api/basic/request-upload.h2.any.js b/fetch/api/basic/request-upload.h2.any.js
index 6812227..eedc2bf 100644
--- a/fetch/api/basic/request-upload.h2.any.js
+++ b/fetch/api/basic/request-upload.h2.any.js
@@ -184,26 +184,3 @@
   await promise_rejects_js(t, TypeError, fetch(url, { method, body, duplex }));
 }, "Streaming upload should fail on a 401 response");
 
-promise_test(async (t) => {
-  const abortMessage = 'foo abort';
-  let streamCancelPromise = new Promise(async res => {
-    var stream = new ReadableStream({
-      cancel: function(reason) {
-        res(reason);
-      }
-    });
-    let abortController = new AbortController();
-    let fetchPromise = promise_rejects_exactly(t, abortMessage, fetch('', {
-                                                 method: 'POST',
-                                                 body: stream,
-                                                 duplex: 'half',
-                                                 signal: abortController.signal
-                                               }));
-    abortController.abort(abortMessage);
-    await fetchPromise;
-  });
-
-  let cancelReason = await streamCancelPromise;
-  assert_equals(
-      cancelReason, abortMessage, 'ReadableStream.cancel should be called.');
-}, 'ReadbleStream should be closed on signal.abort');