[cleanup] Remove annoying warning from ARIAUtils.ts
[cleanup] Remove annoying warning from ARIAUtils.ts

The warning doesn't seem to be valuable (judging by the fact that it's
not being addressed, even though the E2E logs are full of it) and is
therefore considered unnecessary noise.

Bug: none
Change-Id: I6b67c93ec70cfbc565e3caa467408f0454117fcb
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3596791
Reviewed-by: Changhao Han <68542faf32f0a558a873c0f094ca9bedb2744bff@chromium.org>
Commit-Queue: Benedikt Meurer <024a1e0af501338d11c3b837c6193d11c140d792@chromium.org>

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