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We have changed the MyFiles path inside Android to use its UUID.
As a result, we need to accordingly change the path constant defined in
RecentArcMediaSource to avoid a duplicate entry in Files app Media View.

BUG=1040386
BUG=1148625
TEST=Edit an image file under MyFiles (by e.g. renaming, rotating).
TEST=Confirm that no duplicate entry for the file is found under the
TEST="Images" and "Recent" tabs in the Chrome OS Files app.

Change-Id: Ib0c72a883b4c959f429af2dea3ad73b29d1563b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560082Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Youkichi Hosoi <youkichihosoi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832704}