Revert "cheets_CTS/GTS: Enable NotificationWidthIncrease experiment"

This reverts commit fb5f0274362455acbb02f3f96cc18cb2ddcbbe6d.

Reason for revert: M128 is branching.

BUG=b:346689363

Original change's description:
> cheets_CTS/GTS: Enable NotificationWidthIncrease experiment
>
> This CL temporarily enables the  feature flags to verify it against
> CTS/GTS.
>
> BUG=b:346689363
> TEST=None
>
> Change-Id: Ie63245a9afcef2117a828d4d92b3c4e9ab8fd9dd
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/5624456
> Tested-by: Toshiki Kikuchi <toshikikikuchi@chromium.org>
> Commit-Queue: Toshiki Kikuchi <toshikikikuchi@chromium.org>
> Reviewed-by: Shao-Chuan Lee <shaochuan@chromium.org>

BUG=b:346689363

Change-Id: I75325f9b8234ffd62a8bee86cf4d893c77014ad1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/5715510
Commit-Queue: ChromeOS Auto Runner <chromeos-auto-runner@chromeos-bot.iam.gserviceaccount.com>
Reviewed-by: Shao-Chuan Lee <shaochuan@chromium.org>
Tested-by: Toshiki Kikuchi <toshikikikuchi@chromium.org>
Commit-Queue: Toshiki Kikuchi <toshikikikuchi@chromium.org>
diff --git a/server/cros/tradefed/tradefed_chromelogin.py b/server/cros/tradefed/tradefed_chromelogin.py
index ccf73a5..8105396 100644
--- a/server/cros/tradefed/tradefed_chromelogin.py
+++ b/server/cros/tradefed/tradefed_chromelogin.py
@@ -116,8 +116,6 @@
         cmd += ' --no-popup-notification'
         # Always disable external storage for ARC
         cmd += ' --disable-feature=ArcExternalStorageAccess'
-        # TODO(b/346689363): Revert this before M128 branch cut.
-        cmd += ' --feature=NotificationWidthIncrease'
         # Toggle the translation from houdini to ndk
         if self._toggle_ndk:
             cmd += ' --toggle_ndk'