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Updates prerender and safe browsing browser tests to initialize the
SafeBrowsingDatabaseManager after BrowserThreads were created (but
before they are started). This is required for the upcoming move of
BrowserThread::PostTask to base/task/post_task.h, as construction of
SafeBrowsingDatabaseManager obtains a TaskRunner for the IO thread.
In the future, this has to happen after thread initialization.

Bug: 878356
Change-Id: I1d4c614690ba3aacf4887fefe57d378c23668706
Reviewed-on: https://chromium-review.googlesource.com/1211735Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589488}