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This should not change during Chrome runtime, and thus is passed
directly from the factory, similarly as we do for product version.

Since we use the term "app locale", for consistency we also rename
"product version" into "app version".

Finally, as this addition caused even more repetition in tests, some
common functionality has been extracted, and on the way, the ordering
of expectations fixed.

BASE: 731423
Bug: 781765
Change-Id: Id8093692a0cadd0d3ac127266dc9a814e780f602
Reviewed-on: https://chromium-review.googlesource.com/763510
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515940}