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This change should make it easier to make HomeDirMethods completely
pass-through, and eventually the method should live with CryptohomeClient.

Bug: 741274
Change-Id: I478f0de229cda544121fa57de870a6082f603961
Reviewed-on: https://chromium-review.googlesource.com/776533
Commit-Queue: Maajid <maajid@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517755}