Fix NaCl compilation

nethelpers.cc was using LOG() but didn't include logging.h

R=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/6829005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5360 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/base/nethelpers.cc b/talk/base/nethelpers.cc
index e4d0c52..5fb6cdd 100644
--- a/talk/base/nethelpers.cc
+++ b/talk/base/nethelpers.cc
@@ -34,6 +34,7 @@
 #endif
 
 #include "talk/base/byteorder.h"
+#include "talk/base/logging.h"
 #include "talk/base/signalthread.h"
 
 namespace talk_base {