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|AlternativeBrowserLauncher| uses prefs to decide which browser to
launch, and then uses an |AlternativeBrowserDriver| to do I/O operations
that launch the browser.

Bug: 876804
Change-Id: I8461d72e8fb711a50148c3d7f27a2b286493df9f
Reviewed-on: https://chromium-review.googlesource.com/1197185
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589267}