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This removes UpdateAccelerators() as calls to View::ResetAccelerators()
remove dialog buttons' VKEY_RETURN default handlers as well. Removing
UpdateAccelerators() works as DialogModelField accelerators are const on
construction so they never need to be updated.

Bug: 1106422
Change-Id: I1d39cc3d72c6ab043381f8a5c858b1b2ed828558
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355290
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798183}