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The status quo test compares the actual header with the header returned
by GetClientDataHeaders(). However, as discussed in [1], the important
thing to verify is that the GOOGLE_WEB_PROPERTIES_SIGNED_ID-associated
VariationID is included in the header when expected.

Similarly, update the UserNotSignedIn test to check that the ID is not
included in the header.

Also, remove CreateTrialAndAssociateId() from the browser test file
since it now exists in variations_test_utils.h.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2461906/comment/d6233bfd_454a08ff/

Bug: 1134444
Change-Id: I22101a138f930e2b1cfaf4ba3f74211eb87c9a49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508338Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#823554}