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To do this as cleanly as possible, added CanMinimizeDialog method to
WebDialogDelegate. This is used by WebDialogView. The default return value is
false. This should only be used when there is a corresponding shelf item for
the dialog.

Bug: 1122481
Change-Id: Id0da680c4c88ac7462f8cc3d4111cda767ea4bfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379450
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: David Munro <davidmunro@google.com>
Auto-Submit: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802660}