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There are three sections of AccountTracker unittests:
- Primary account only
- Secondary accounts
- Interaction between primary and secondary accounts

In each of these sections, non-ChromeOS tests were scattered throughout.
This CL consolidates the non-ChromeOS tests so that there is one set
of non-ChromeOS tests at the end of each section.

Followup to
https://chromium-review.googlesource.com/c/chromium/src/+/1148200.

Change-Id: I5e89a78a1d493ecd25b75d495969dda68f2b136e
Reviewed-on: https://chromium-review.googlesource.com/1158830
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580120}