Revert "Dispatch input events after changing the element's selection"

This reverts commit e8649745df235b61d061783dfb7af86ac0d130fe.

Reason for revert: seems to cause test failure on
linux-blink-web-tests-force-accessibility-rel.

Original change's description:
> Dispatch input events after changing the element's selection
>
> There was an old WebKit bug filed about this [1] that got resolved in
> WebKit [2] but not in blink.
>
> The new proposed order simplifies Autofill's logic that now posts tasks
> regarding input change events so that by the time they're processed the
> selection would've been set properly.
>
> It also resolves flakiness of some PasswordManager test [3].
>
> [1] https://bugs.webkit.org/show_bug.cgi?id=16976
>
> [2]
> https://sourcegraph.com/github.com/WebKit/WebKit@fecc89c90d3967bdf270e618601ca8b0d579ab0a/-/blob/Source/WebCore/editing/Editor.cpp?L1250-1263
>
> [3] https://g-issues.chromium.org/issues/382342234#comment18
>
> Bug: 394260849
> Change-Id: Id5acb4b4efd16cca52fad4daae0c8327d4f3dd74
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6198782
> Commit-Queue: Jihad Hanna <jihadghanna@google.com>
> Reviewed-by: Siye Liu <siliu@microsoft.com>
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1419127}

Bug: 394260849, 396056949
Change-Id: Ieccf822205ad79c3494d101b55fc69d77767ef5b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6254538
Auto-Submit: Rushan Suleymanov <rushans@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/main@{#1419176}