Remove PasswordStoreWin class

This CL implements the first step in removing PasswordStoreWin and related code
(more context in the design doc linked at
* Deleting the PasswordStoreWin class and replacing it with PasswordStoreDefault
  on Windows.
* Marking a metric measured in the deleted code as obsolete.

Bug: 456119
Change-Id: I326e05101f904e3afd56fbb5dcce22e0ba2f2729
Commit-Queue: Uladzimir Miniailau <>
Reviewed-by: Ilya Sherman <>
Reviewed-by: Vaclav Brozek <>
Cr-Commit-Position: refs/heads/master@{#576802}
7 files changed