[GCPW] Add "Forgot Password" button.

- A user is now allowed to bypass entering their old password when
updating their windows password if they forgot their old password.
- The user's password will be forcefully reset once they confirm
they wish to reset their password. This will cause them to lose
all their encrypted data.

Bug: 912609
Change-Id: I308a41d2ba278c0e15c6976fb41bb0ebcf9bd414
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1551465
Commit-Queue: Tien Mai <tienmai@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#647766}
15 files changed