Automated g4 rollback of changelist 243900946.

*** Reason for rollback ***

This broke the google3 auth build on Mac and Windows, and breaks the Kokoro build on all desktop platforms

*** Original change description ***

[Auth] Add linux secure manager file.

+ Support Save/Load/Delete/DeleteAll
+ Add Tests

***

PiperOrigin-RevId: 244210474

Author: a-maurice