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FakeCryptohomeClient is changed to simluate an ecryptfs user home only
if this has been configured by
FakeCryptohomeClient::SetEcryptfsUserHome, which supersedes
set_needs_dircrypto_migration.
Configuring a user home to be ecryptfs will have two effects:
NeedsDircryptoMigration will return true for the user home and
MountEx will fail if forcing dircrypto.

Until this CL, FakeCryptohomeClient was pretending that all mounts are
still on ecryptfs, which was masked by the migration being disallowed in
ExistingUserController (due to assumed enterprise user policy in the
browsertests).

Bug: 832127
Change-Id: I0cd95c55d1c0fcb8a6bd862f7e9eeffcde9ecd46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515405
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824153}