Manual revert of Timezone auto update option should be available by default.

Manual revert of Timezone auto update option should be available by default.

Reason for revert:
4000+ browser test are failing on ChromeOS after this patch and this is the only patch that touches ChromeOS in the blamelist.

Seems like with the switch enabled, we are creating the GetTimezoneResolver that leaks the g_browser_process->system_request_context()

Sample failure:
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/37149

Original issue's description:
> https://codereview.chromium.org/898503002
> Timezone auto update option should be available by default.
>
> This CL makes "timezone auto update" feature available (but > switched off by
> default) to users. And adds flag to disable this feature.
>
> BUG=416494
> TEST=manual
>
> Committed:
> https://crrev.com/13bb9e13b4719c96112ca8770d2c7b48c23e150d
> Cr-Commit-Position: refs/heads/master@{#314615}

TBR=alemate
TEST=MANUAL
NOTRY=true
NOTREECHECKS=true
NOPRESUBMIT=true

Committed: https://crrev.com/44036d053dc7731deb8fdf5d20603bbb8b1c19a5
Cr-Commit-Position: refs/heads/master@{#314663}

[kelvinp, 2015-02-04 22:25:03]

kelvinp@chromium.org changed reviewers:
+ alemate@chromium.org, ccameron@chromium.org

[kelvinp, 2015-02-04 22:38:46]

The CQ bit was checked by kelvinp@chromium.org

[commit-bot: I haz the power, 2015-02-04 22:39:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/899113002/1

[commit-bot: I haz the power, 2015-02-04 22:41:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-04 22:42:11]

Patchset 1 (id:??) landed as
https://crrev.com/44036d053dc7731deb8fdf5d20603bbb8b1c19a5
Cr-Commit-Position: refs/heads/master@{#314663}