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Profile::GetCreationTime relied on the directory's creation time, which
is not supported by all the file systems. For example, in POSIX we use
the st_ctim property, which is the last file status change timestamp.
Using the prefs will ensure that the creation time never changes if the
profile directory is copied or if the file creation time is not
supported by the file system. This also ensures that
Profile::GetCreationTime works properly across enterprise snapshots.

Bug: 958893
Change-Id: I4e6189642939bb52524c412a9146087d597320dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079163
Commit-Queue: Yann Dago <ydago@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746813}