Ben Kwa 3b19e31e18 Replace error/info footers with a message bar.
- Remove footers from DirectoryFragment.
- Add a new MessageBar fragment that can display error/info messages.

BUG=22638983

Change-Id: I2075ae8e4dca8954a09c1fc57ed62bb6d3bff7a9
2015-09-18 13:53:41 -07:00
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