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Before the CL, in case when external removable drive had '#' character
in its name it caused that disk was not accessible through Files App.
The user was able to select the drive, but no content was displayed
neither they were able to add new files to the drive.

This CL sanitizes and suggests mount point names for all mountable
drives to prevent mounting a device with '#' in its name.

Bug: 774241

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I90e5808bb0d8b4a26becaf9ba30b538ce580b3dd
Reviewed-on: https://chromium-review.googlesource.com/720639Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Klemen Kozjek <klemenko@google.com>
Cr-Commit-Position: refs/heads/master@{#509325}