Revert of Update sync promo string in chrome://settings

Revert of Update sync promo string in chrome://settings (patchset #1 id:100001 of https://codereview.chromium.org/904513002)

Reason for revert:
165 Browser test crashing on Linux after the patch

Sample failure:
http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29/builds/38668/steps/browser_tests/logs/OptionsWebUIExtendedTest.ShowPageWithHistory

Original issue's description:
> Update sync promo string in chrome://settings
>
> BUG=455273
> Committed: https://crrev.com/fdef2865f067f30e99f1f11b33d8811d98bf1e54
> Cr-Commit-Position: refs/heads/master@{#314875}

TBR=noms@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/d7bcb2ebabea0864c09f746f53abee15cf74ac5b
Cr-Commit-Position: refs/heads/master@{#314903}

[kelvinp, 2015-02-05 22:40:28]

The CQ bit was checked by kelvinp@chromium.org

[commit-bot: I haz the power, 2015-02-05 22:40:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/884743004/1

[commit-bot: I haz the power, 2015-02-05 22:41:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 22:42:42]

Patchset 1 (id:??) landed as
https://crrev.com/d7bcb2ebabea0864c09f746f53abee15cf74ac5b
Cr-Commit-Position: refs/heads/master@{#314903}