Let sync backup/rollback manager return a dummy encryption handler.

Let sync backup/rollback manager return a dummy encryption handler.

Backup/rollback doesn't require encryption while sync backend currently
assumes there's an encryption handler ready to use. So use a dummy one
to avoid crash.

BUG=362679
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269147

[Nicolas Zea, 2014-05-06 18:57:57]

LGTM. And double checking, but we're not backing up passwords right?

[haitaol1, 2014-05-06 20:50:49]

On 2014/05/06 18:57:57, Nicolas Zea wrote:
> LGTM. And double checking, but we're not backing up passwords right?

right.

[haitaol1, 2014-05-07 20:04:17]

The CQ bit was checked by haitaol@chromium.org

[commit-bot: I haz the power, 2014-05-07 20:08:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/haitaol@chromium.org/268163002/20001

[commit-bot: I haz the power, 2014-05-08 00:41:00]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium

[commit-bot: I haz the power, 2014-05-08 01:25:44]

FYI, CQ is re-trying this CL (attempt #2).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium

[commit-bot: I haz the power, 2014-05-08 03:25:54]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium

[commit-bot: I haz the power, 2014-05-08 03:59:00]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-08 03:59:00]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium

[haitaol1, 2014-05-08 17:07:21]

The CQ bit was checked by haitaol@chromium.org

[commit-bot: I haz the power, 2014-05-08 17:11:46]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/haitaol@chromium.org/268163002/20001

[commit-bot: I haz the power, 2014-05-09 01:53:08]

Change committed as 269147