Remove redundant handling of the default_browser_setting_enabled policy.

Remove redundant handling of the default_browser_setting_enabled policy.

While the default browser infobar should be suppressed when policy is
used to enforce defaultness, there is no need to handle the policy in
the infobar as it is already fully handled in BrowserProcessImpl.

BUG=531649
TEST=Verify that all settings of
https://www.chromium.org/administrators/policy-list-3#DefaultBrowserSettingEnabled
work properly. If the policy is set (either enabled or disabled), the
default browser bar should not appear. On Windows 7, Chrome should
become the default browser at startup when the policy is enabled. If the
policy is unset and Chrome is not the default browser, the default
browser infobar should appear.
R=pastarmovj@chromium.org

Committed: https://crrev.com/22a6f88626b2cf12e55e11eda3f1246313037483
Cr-Commit-Position: refs/heads/master@{#349889}

[grt (UTC plus 2), 2015-09-14 16:32:50]

PTAL

[grt (UTC plus 2), 2015-09-16 16:46:23]

grt@chromium.org changed reviewers:
+ pkasting@chromium.org

[grt (UTC plus 2), 2015-09-16 16:46:24]

pkasting: could you take a look at this? thanks.

[Peter Kasting, 2015-09-16 23:19:19]

LGTM on code change, I trust you (and the test directions) regarding whether
this is theoretically corrct :)

[grt (UTC plus 2), 2015-09-19 01:34:47]

On 2015/09/16 23:19:19, Peter Kasting wrote:
> LGTM on code change, I trust you (and the test directions) regarding whether
> this is theoretically corrct :)

Thank you. I will go ahead and land this.

Julian: please take a look at your earliest convenience and let me know if this
change is wrong. Thanks!

[grt (UTC plus 2), 2015-09-19 01:34:51]

The CQ bit was checked by grt@chromium.org

[commit-bot: I haz the power, 2015-09-19 01:35:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1344593002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1344593002/20001

[commit-bot: I haz the power, 2015-09-19 02:17:18]

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

[commit-bot: I haz the power, 2015-09-19 02:17:19]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[grt (UTC plus 2), 2015-09-20 22:44:21]

The CQ bit was checked by grt@chromium.org

[commit-bot: I haz the power, 2015-09-20 22:44:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1344593002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1344593002/20001

[commit-bot: I haz the power, 2015-09-20 23:36:32]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-20 23:37:08]

Patchset 2 (id:??) landed as
https://crrev.com/22a6f88626b2cf12e55e11eda3f1246313037483
Cr-Commit-Position: refs/heads/master@{#349889}

[pastarmovj, 2015-09-24 14:14:58]

lgtm