GitLab

This lets dialogs that don't need to store state inside a DialogModel
avoid instantiating (and subclassing) a DialogModelDelegate.

DialogModel::Builder::model() is added to permit accessing a pointer to
the model before it's been built so that it can be bound to callbacks.

This change removes DialogModelDelegate use from WindowNamePrompt and
OutdatedUpgradeBubbleView.

Bug: 1106422
Change-Id: I66119536ae30e8d7a6a3232bea265b57cb8c9346
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442500Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813448}