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Improve structure and documentation for AccountConsistencyServiceTest.

These tests are crucial to ensure that sign-in cookies are properly set
within the framework. With the recent and upcoming changes in ensuring
identity consistency across platforms, we, as developers, need to ensure
that this code continues to work as expected.

Bug: 1148814
Change-Id: I734e7c150c612f11371079c60e61f8e3b2bdc230
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536445Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827765}