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The absolute path for the mount point of Android files is long and not user
friendly. We should replace the path with the "Play files" label, which we use
in Files app UI.

Bug: 863616
Test: Manually tested on ARC-enabled device with multiple languages.
Change-Id: I96548e96489c8480736f8cfc1de53f1c838eb98b
Reviewed-on: https://chromium-review.googlesource.com/1145100Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579324}