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Enable ChromeRenderProcessHostBackgroundingTest.MultipleTabs on Linux.

While |base::Process::CanBackgroundProcesses()| returns false on Linux,
we are still able to verify whether processes are backgrounded by
looking at RenderProcessHost::IsProcessBackgrounded().  This
verification is not as thorough/end-to-end as what we can do on other
platforms, but it is sufficient to enable
ChromeRenderProcessHostBackgroundingTest.MultipleTabs test on Linux.

Bug: 881812, 883468
Change-Id: I536ea10a279d7138d632b8846dc2a0d8e507c001
Reviewed-on: https://chromium-review.googlesource.com/1222249
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591363}