Sync wallpaper based on sync themes setting

Reland issue 671513010 check sync themes setting patch.

Seems the revert is a false alarm so reland the original patch.

refer to
https://codereview.chromium.org/682463002/

BUG=236640
TBR=scheib@chromium.org,cpu@chromium.org,jar@chromium.org,bshe@chromium.org

Committed: https://crrev.com/4289d3a25b4a21c8ea3c1dd2cf08c8c94e344001
Cr-Commit-Position: refs/heads/master@{#301415}

[Ran, 2014-10-27 15:01:33]

The CQ bit was checked by ranj@chromium.org

[commit-bot: I haz the power, 2014-10-27 15:02:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/676403002/1

[commit-bot: I haz the power, 2014-10-27 15:02:07]

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

[commit-bot: I haz the power, 2014-10-27 15:02:08]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Ran, 2014-10-27 15:11:15]

The CQ bit was checked by ranj@chromium.org

[commit-bot: I haz the power, 2014-10-27 15:11:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/676403002/1

[commit-bot: I haz the power, 2014-10-27 15:11:48]

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

[commit-bot: I haz the power, 2014-10-27 15:11:49]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Ran, 2014-10-27 15:17:31]

The CQ bit was checked by ranj@chromium.org

[commit-bot: I haz the power, 2014-10-27 15:18:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/676403002/1

[commit-bot: I haz the power, 2014-10-27 15:18:32]

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

[commit-bot: I haz the power, 2014-10-27 15:18:34]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Ran, 2014-10-27 15:23:34]

The CQ bit was checked by ranj@chromium.org

[bshe, 2014-10-27 15:24:14]

On 2014/10/27 15:18:34, I haz the power (commit-bot) wrote:
> No LGTM from a valid reviewer yet. Only full committers are accepted.
> Even if an LGTM may have been provided, it was from a non-committer or
> a provisional committer, _not_ a full super star committer.
> See http://www.chromium.org/getting-involved/become-a-committer
> Note that this has nothing to do with OWNERS files.

lgtm

[commit-bot: I haz the power, 2014-10-27 15:24:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/676403002/1

[commit-bot: I haz the power, 2014-10-27 16:29:39]

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

[commit-bot: I haz the power, 2014-10-27 16:29:40]

Try jobs failed on following builders:
  linux_chromium_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Ran, 2014-10-27 17:56:48]

The CQ bit was checked by ranj@chromium.org

[commit-bot: I haz the power, 2014-10-27 17:57:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/676403002/1

[commit-bot: I haz the power, 2014-10-27 19:35:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-27 19:36:56]

Patchset 1 (id:??) landed as
https://crrev.com/4289d3a25b4a21c8ea3c1dd2cf08c8c94e344001
Cr-Commit-Position: refs/heads/master@{#301415}