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There's no longer a dependency on any system fonts when running Linux tests, so
font packages may be removed.  The CrOs fonts are kept because, presumably,
folks might still want them when testing Linux CrOs builds, though the CrOs
tests also no longer depend on any system fonts.

BUG=787020
R=dpranke

Change-Id: I6074842eb67eba6194fa90e549e0485b529aa814
Reviewed-on: https://chromium-review.googlesource.com/1036585Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554930}