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The class InSessionPasswordChangeHandler manages a dialog where the
user can change their password in-session. If cryptohome password
migration fails, then the handler is notified via a callback. This
callback is where we would help the user to solve the problem.

However, the Handler object will not outlive the dialog, so if the
user closes the dialog, then the callback will not be called, and
the password change will never be fully completed.

To fix this problem, this CL moves the callbacks to a
PrimaryProfileService - the InSessionPasswordChangeManager.
No actual functionality is changed - it just means that these
callbacks (which don't yet do a lot) will still be called even
if the dialog is closed.

Bug: 930109
Change-Id: I520744406251645c6a98b4ea20acd5a19088d1d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1655649
Commit-Queue: A Olsen <olsen@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670203}