Cleanup: Remove many unused wstring string_utils.

Cleanup: Remove many unused wstring string_utils.

BUG=23581
R=scottmg@chromium.org, thakis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=236685

[scottmg, 2013-11-21 23:29:18]

c/b/gamepad lgtm

[Nico, 2013-11-22 00:09:33]

lgtm

BUG=string16 bug?

[Lei Zhang, 2013-11-22 00:10:43]

On 2013/11/22 00:09:33, Nico (in Tokyo until Nov 25) wrote:
> lgtm
> 
> BUG=string16 bug?

http://crbug.com/23581

[commit-bot: I haz the power, 2013-11-22 00:13:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/thestig@chromium.org/80813002/210001

[commit-bot: I haz the power, 2013-11-22 00:33:59]

Retried try job too often on chromium_presubmit for step(s) presubmit
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

[scottmg, 2013-11-22 00:42:54]

On 2013/11/22 00:33:59, I haz the power (commit-bot) wrote:
> Retried try job too often on chromium_presubmit for step(s) presubmit
>
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=chromium_p...

New code should not use wstrings.  If you are calling a cross-platform API that
accepts a wstring, fix the API.
    base/strings/string_util.cc:348

Ironic chromium_presubmit ftw!

[Lei Zhang, 2013-11-22 02:29:10]

Committed patchset #1 manually as r236685 (presubmit successful).