Don't depend on //content from MutableProfileOAuth2TokenServiceDelegate

Remove the dependency from the production file by having a reference to
the NetworkConnectionTracker in MutableProfileOAuth2TokenServiceDelegate,
and from the associated unit test by relying on ScopedTaskEnvironment.

Bug: 922555
Change-Id: I7e5885cb41007ec5ee72f562b9cca48f307338f0
Reviewed-on: https://chromium-review.googlesource.com/c/1424880
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624772}
4 files changed