Don't switch to the default display root if the current entry is fake.

If a FakeItem is the current entry and a volume is mounted or unmounted,
Files app switches to the default display root since the FakeItem
doesn't have a VolumeInfo. Omit switching if the current root is not a
native entry.

Bug: 900870
Change-Id: I943959112135ceb5752207f87e6810a4ec60ae0f
Commit-Queue: Sam McNally <>
Reviewed-by: Luciano Pacheco <>
Cr-Commit-Position: refs/heads/master@{#605221}
3 files changed