cros: Enable encryption migration UI by default.

cros: Enable encryption migration UI by default.

Now that the back-end migration logic is ready, we should enable the migration UI by default.
This CL does:
- Modify encryption migration's flag type from SINGLE_VALUE_TYPE to ENABLE_DISABLE_VALUE_TYPE to have a default value.
- Enable encryption migration by default on ToT.

BUG=713454
TEST=manually tested the #enable-encryption-migration flag that "Enabled" and "Default" shows migration UI and "Disabled" doesn't.
TBR=xiyuan@chromium.org,isherman@chromium.org

Review-Url: https://codereview.chromium.org/2830933004
Cr-Commit-Position: refs/heads/master@{#466232}
(cherry picked from commit 3e769db4f707bbc5962ee1aa0a1c727081ee754a)

Review-Url: https://codereview.chromium.org/2848473002 .
Cr-Commit-Position: refs/branch-heads/3071@{#250}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/d5e61d3674614164036a6a3746eb79c26648ac5c

[fukino, 2017-04-27 01:50:31]

Description was changed from

==========
cros: Enable encryption migration UI by default.

Now that the back-end migration logic is ready, we should enable the migration
UI by default.
This CL does:
- Modify encryption migration's flag type from SINGLE_VALUE_TYPE to
ENABLE_DISABLE_VALUE_TYPE to have a default value.
- Enable encryption migration by default on ToT.

BUG=713454
TEST=manually tested the #enable-encryption-migration flag that "Enabled" and
"Default" shows migration UI and "Disabled" doesn't.
TBR=xiyuan@chromium.org,isherman@chromium.org

Review-Url: https://codereview.chromium.org/2830933004
Cr-Commit-Position: refs/heads/master@{#466232}
(cherry picked from commit 3e769db4f707bbc5962ee1aa0a1c727081ee754a)
==========

to

==========
cros: Enable encryption migration UI by default.

Now that the back-end migration logic is ready, we should enable the migration
UI by default.
This CL does:
- Modify encryption migration's flag type from SINGLE_VALUE_TYPE to
ENABLE_DISABLE_VALUE_TYPE to have a default value.
- Enable encryption migration by default on ToT.

BUG=713454
TEST=manually tested the #enable-encryption-migration flag that "Enabled" and
"Default" shows migration UI and "Disabled" doesn't.
TBR=xiyuan@chromium.org,isherman@chromium.org

Review-Url: https://codereview.chromium.org/2830933004
Cr-Commit-Position: refs/heads/master@{#466232}
(cherry picked from commit 3e769db4f707bbc5962ee1aa0a1c727081ee754a)

Review-Url: https://codereview.chromium.org/2848473002 .
Cr-Commit-Position: refs/branch-heads/3071@{#250}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/d5e61d3674614164036a6a3746eb...
==========

[fukino, 2017-04-27 01:50:33]

Committed patchset #1 (id:1) manually as
d5e61d3674614164036a6a3746eb79c26648ac5c.