ehmaldonado 3e3b6f2805 Remove Chromium Clang warnings only on Windows.
A previous CL (https://codereview.webrtc.org/2281513002) broke Windows, Mac and Linux bots in WebRTC's Chromium FYI, by suppressing these warnings when they hadn't been set.

This CL fixes it suppressing warnings only on Windows.

Example failures:
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Win%20Builder/builds/6540
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Mac%20Builder/builds/16588
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Linux%20Builder/builds/9655

BUG=webrtc:6255
NOTRY=True

Review-Url: https://codereview.webrtc.org/2284333002
Cr-Commit-Position: refs/heads/master@{#13951}
2016-08-29 09:56:10 +00:00
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