Revert 198920 "clang: Turn on C++11 on CrOs too."

Revert 198920 "clang: Turn on C++11 on CrOs too."

Linux Chromium OS ASAN Builder is still not on Precise, apparently.

> clang: Turn on C++11 on CrOs too.
> 
> This was blocked on the main waterfall linux_chromeos_clang bot migrating
> to precise, which has happened now.
> 
> I believe all bots that build chromeos with clang are on precise now. If any
> turns red, this CL should be reverted.
> 
> BUG=none
> R=ajwong@chromium.org
> 
> Review URL: https://codereview.chromium.org/14992005

TBR=thakis@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=198924

[Nico, 2013-05-08 16:32:14]

Committed patchset #1 manually as r198924.