Revert "Checked Span: Enable in release"

This reverts commit 41af5c65823240f0a1510b3d9e9990d0c1e03252.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/5663475524173824

Sample build with failed test: https://ci.chromium.org/b/8684007343561524673
Affected test(s):
[://\:headless_shell_wpt!webtest::external/wpt/fledge/tentative#private-aggregation.https.window.html?16-20](https://ci.chromium.org/ui/test/chromium/:%2F%2F%5C:headless_shell_wpt%21webtest::external%2Fwpt%2Ffledge%2Ftentative%23private-aggregation.https.window.html%3F16-20?q=VHash%3A53d021cf126e7a21)

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F5663475524173824&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F7624900&type=BUG

Original change's description:
> Checked Span: Enable in release
>
> We fully expect this to get reverted, perhaps automatically, and that's
> all right. This CL is intended to show the viability (or the major sharp
> edges) of Checked Span in a canary / dev release of Chrome.
>
> Change-Id: Ice22e05e5bf050dc09b1eeb1f3b8226ba1c75dbe
> Bug: 501113358
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7624900
> Auto-Submit: Kalvin Lee <kdlee@chromium.org>
> Reviewed-by: Stephen Nusko <nuskos@chromium.org>
> Commit-Queue: Stephen Nusko <nuskos@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1617375}
>

Bug: 501113358
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ib21e36e42729a78cc91b59a938bfb455e39491e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7778248
Reviewed-by: Muyao Xu <muyaoxu@google.com>
Commit-Queue: Muyao Xu <muyaoxu@google.com>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Amelie Schneider <amelies@google.com>
Owners-Override: Sébastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1617711}
NOKEYCHECK=True
GitOrigin-RevId: f37c02dfb3a26a7283e8584df6c4f505daf2f8f7