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- Print history will be deleted when a user clears their
  browser history.
- Future CL will include a policy pref to disable this.
- Implements PrintJobsObserver Mojo interface.
- This CL is the initial work to start supporting automatic
  updates to the print management app.
- Feature is disabled until policy is implemented.

Bug: 1053704
Test: browser_tests
Change-Id: I283fce0eb1a850bce4b577aeaa71059b11fe1acb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2204524
Commit-Queue: jimmy gong <jimmyxgong@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773942}