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This refactor removes dependency on UserManagerView from
UserManagerProfileDialogDelegate. This will allow the ProfilePickerView
to host a UserManagerProfileDialog as well.

The dependency is removed by introducing a new
UserManagerProfileDialogHostBase class that also holds common logic for
managing dialogs. ProfilePickerView is going to add
UserManagerProfileDialogHostBase as a base class in a follow-up CL.

Bug: 1156096
Change-Id: Ib9e2a4e5c0c4060c96ab083aca1af71706a25e61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575024
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835137}