remoting: Suppress a clang warning that fires in atl headers.

remoting: Suppress a clang warning that fires in atl headers.

Suppresses

In file included from ..\..\remoting/host/verify_config_window_win.h:10:
..\..\third_party\wtl\include\atlapp.h(1683,17) :  warning(clang): using namespace directive in global context in header [-Wheader-hygiene]
using namespace WTL;
                ^

BUG=5027, 82385
TBR=jamiewalch@chromium.org

Committed: https://crrev.com/f49fcfbf0db909f48d245f06240f184d473ec55d
Cr-Commit-Position: refs/heads/master@{#292821}

[Nico, 2014-08-31 20:24:30]

thakis@chromium.org changed reviewers:
+ jamiewalch@chromium.org

[Nico, 2014-08-31 20:24:30]

It looks like there are only 7 files that include ATL in remoting. Do you think
your team could set some time aside some time this year to get rid of remoting's
atl dependency?

[Nico, 2014-08-31 20:58:52]

Committed patchset #1 (id:1) manually as f49fcfb (presubmit successful).

[commit-bot: I haz the power, 2014-09-10 03:15:11]

Patchset 1 (id:??) landed as
https://crrev.com/f49fcfbf0db909f48d245f06240f184d473ec55d
Cr-Commit-Position: refs/heads/master@{#292821}