Properly ifdef sync code in password_manager

Properly ifdef sync code in password_manager

Fix one misplaced header include and use PASSWORD_MANAGER_ENABLE_SYNC
macro to properly guard the other place of sync usage to fix a linking
issue when PASSWORD_MANAGER_ENABLE_SYNC is disabled.

Committed: https://crrev.com/e13de14ab0eba806c7e065bbb56e1a66ae3ee5e7
Cr-Commit-Position: refs/heads/master@{#317043}

[Jiang Jiang, 2015-02-19 13:00:46]

jiangj@opera.com changed reviewers:
+ gcasto@chromium.org

[Jiang Jiang, 2015-02-19 13:00:46]

PTAL.

[Mike West, 2015-02-19 13:02:23]

mkwst@chromium.org changed reviewers:
+ mkwst@chromium.org

[Mike West, 2015-02-19 13:02:23]

LGTM.

[Jiang Jiang, 2015-02-19 13:03:11]

On 2015/02/19 13:02:23, Mike West wrote:
> LGTM.

Well, that was quick, thanks!

[Jiang Jiang, 2015-02-19 13:03:14]

The CQ bit was checked by jiangj@opera.com

[commit-bot: I haz the power, 2015-02-19 13:04:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/943533002/1

[commit-bot: I haz the power, 2015-02-19 14:22:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-19 14:23:40]

Patchset 1 (id:??) landed as
https://crrev.com/e13de14ab0eba806c7e065bbb56e1a66ae3ee5e7
Cr-Commit-Position: refs/heads/master@{#317043}