kjellander d56d68cd27 system_wrappers: Fix include header guards.
This should have been a part of https://codereview.webrtc.org/1413333002/

The header guard PRESUBMIT rule is being enabled in
https://codereview.webrtc.org/1419203005 so things like this won't
happen in the future.

BUG=5095
NOTRY=True

Review URL: https://codereview.webrtc.org/1425693005

Cr-Commit-Position: refs/heads/master@{#10475}
2015-11-02 10:12:50 +00:00
..