Prevent settings hardening UI from appearing when no resets have occurred.

Prevent settings hardening UI from appearing when no resets have occurred.

TEST=manual: Force a reset (manually edit a protected pref).
Expect to see reset UI in chrome://settings,
dismiss it, restart Chrome, expect no reset UI.
BUG=374360
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271957

[Cait (Slow), 2014-05-20 20:56:43]

Bernhard: PTAL. This CL fixes an issue introduced in
https://codereview.chromium.org/257003007/ where we were changing a pref  before
the code that updates MACs when prefs change was hooked up. As a result, the
changed pref appeared as a tampered pref, and the pref reset UI was shown.
Fix (courtesy of Gab), is to update the MAC for this pref manually when we
change it.

Thanks!

[gab, 2014-05-21 01:29:26]

lgtm, thanks for fixing this while I'm away!

[gab, 2014-05-21 01:29:31]

The CQ bit was checked by gab@chromium.org

[commit-bot: I haz the power, 2014-05-21 01:31:46]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/caitkp@chromium.org/294123003/1

[commit-bot: I haz the power, 2014-05-21 07:35:30]

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
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[Bernhard Bauer, 2014-05-21 07:37:25]

LGTM.

Is there a reason why chromium-reviews is not on CC here?

[commit-bot: I haz the power, 2014-05-21 20:17:05]

Change committed as 271957