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Disable the cancel button in the Webauthn verify pending dialog when
the system OS authentication dialog is shown. At this moment, if user
cancel the OS dialog, the verify pending dialog will also go away.

After user interacts with the system OS dialog, the OS dialog will
go away and the cancel button will be enabled again for users to
cancel the flow if they want.

Bug: 991037
Change-Id: I8760690e377e3d294832dc5278d177eb3017dc65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935493
Commit-Queue: Siyu An <siyua@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Manas Verma <manasverma@google.com>
Cr-Commit-Position: refs/heads/master@{#720832}