[Sync] Remove some unnecessary typedefs in SyncBackendRegistrar.

[Sync] Remove some unnecessary typedefs in SyncBackendRegistrar.

BUG=663125
Committed: https://crrev.com/02403e91e2e3eb39a8545bfe4fa1ec178d9e7a2a
Cr-Commit-Position: refs/heads/master@{#432658}

[maxbogue, 2016-11-16 20:20:41]

The CQ bit was checked by maxbogue@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-16 20:21:33]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-16 21:27:40]

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

[commit-bot: I haz the power, 2016-11-16 21:27:44]

Dry run: Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[maxbogue, 2016-11-16 21:38:17]

maxbogue@chromium.org changed reviewers:
+ skym@chromium.org

[maxbogue, 2016-11-16 21:38:17]

Sky, PTAL!

[skym, 2016-11-16 22:00:58]

lgtm

[maxbogue, 2016-11-16 22:04:09]

The CQ bit was checked by maxbogue@chromium.org

[commit-bot: I haz the power, 2016-11-16 22:05:35]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-16 23:06:07]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-16 23:09:19]

Description was changed from

==========
[Sync] Remove some unnecessary typedefs in SyncBackendRegistrar.

BUG=663125
==========

to

==========
[Sync] Remove some unnecessary typedefs in SyncBackendRegistrar.

BUG=663125

Committed: https://crrev.com/02403e91e2e3eb39a8545bfe4fa1ec178d9e7a2a
Cr-Commit-Position: refs/heads/master@{#432658}
==========

[commit-bot: I haz the power, 2016-11-16 23:09:20]

Patchset 1 (id:??) landed as
https://crrev.com/02403e91e2e3eb39a8545bfe4fa1ec178d9e7a2a
Cr-Commit-Position: refs/heads/master@{#432658}