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Android R starts to restrict other apps to access app's private
directory on R. Based on suggestion from Android engineer, we can use
a few new APIs added in Q and R to move the storage path a non private
directory.

Old path:
/storage/$volume_id/$app_private_directory/Download
New path:
/storage/&volume_id/Download

Bug: 1116905
Change-Id: Iecb34a08648678dbd1ff986c7ee60f3a4647c725
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515262Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826685}