chrome/browser/ui/webauthn: long domains may cause a line break.

As requested by UX in [1], allow long host names to split a title into
two lines. This allows us to show more of the name before eliding,
although sufficiently long names will still trigger elision.

Screenshot at
https://drive.google.com/open?id=1_V6t2CeZDAVazy3Px-OET2LnB__aEW1r.

[1] https://docs.google.com/presentation/d/1TtxkPUchyVZulqgdMcfui-68B0W-DWaFFVJEffGIbLA/edit#slide=id.g5913c4105f_1_12

Change-Id: I70f6541e0db3e9942239304de43b487a7561ca34
Bug: 870892
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1601812
Auto-Submit: Adam Langley <agl@chromium.org>
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658114}
AuthenticatorSelectAccountSheetModel::AuthenticatorSelectAccountSheetModel(
    AuthenticatorRequestDialogModel* dialog_model)
    : AuthenticatorSheetModelBase(dialog_model) {}

AuthenticatorSelectAccountSheetModel::AuthenticatorSelectAccountSheetModel(
    AuthenticatorRequestDialogModel* dialog_model)
    : AuthenticatorSheetModelBase(dialog_model) {}
