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This affects file manager tests, gallery tests, and others. With a few
exceptions, these tests have no use for the browser() that
StartupBrowserCreator creates during startup. Not creating one leaves
more time for the tests to do things they really care about before
potentially timing out.

In fact, _not_ creating the Browser surfaces an existing bug more
prominently. That is, some tests have an iceberg dependency on the
existence of this Browser* that they should never have had in the
first place.

Bug: 736930
Change-Id: I1030e41800f3d2e0e5868ecd64d70c7d30f47c28
Reviewed-on: https://chromium-review.googlesource.com/1117977Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576427}