OAuth2TokenService.java: Remove unused methods and their tests

OAuth2TokenService.java has methods that trigger the firing of
various refresh token-related notifications by
ProfileOAuth2TokenService [the C++ class]. These methods are not
used (thanks to bsazonov@ for detecting that!), and their tests are
problematic, as they cause the notifications to be fired without the
accounts actually being available in PO2TS; this fact violates
an invariant that we would like to put in place wherein PO2TS only
fires refresh token available notifications for accounts for which it
has a refresh token.

This CL simply eliminates these unused methods and their tests.

TBR=msarda@chromium.org

Bug: 883722
Change-Id: Ib44be7db2fbe5341588a9e7ff786f5d166d1ae6c
Reviewed-on: https://chromium-review.googlesource.com/1240275
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593546}
4 files changed