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The test verifies Identity Disc visibility based on navigation location
(NTP vs. other locations), sign-in, and sync state.

To enable testing I updated the logic to retrieve ProfileSyncService
reference instead of using cached reference. I also updated
FakeProfileSyncService to allow controlling sync state from test.

R=twellington@chromium.org

Change-Id: I8fcc672acd0b0a5e7c46e951e4222e7c9cbb8c7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904080Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714816}