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Now the multi-profile feature is turned on by default.
Files.app also always mounts per-profile separated "Downloads"
folder even in the test environment.

BUG=375131

Review URL: https://codereview.chromium.org/295943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272370 0039d316-1c4b-4281-b951-d872f2087c98