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Before this CL when MyFilesVolume flag is enabled users couldn't select
other folders inside MyFiles, only inside MyFiles/Downloads, this CL
fixes it.

The flag MyFilesVolume will be enabled by default in follow up CL.

this CL when MyFilesVolume flag is enabled

Test: browser_tests --gtest_filter=DownloadPrefsTest only passes with
Bug: 873539
Change-Id: I8dc172412a1fd7b7cc69bc82f75c39f29e2f984e
Reviewed-on: https://chromium-review.googlesource.com/c/1433635
Commit-Queue: Min Qin <qinmin@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625733}