Bug 823240 - include sys/proc.h on OpenBSD to access P_TRACED flag, needed since r1.127 of sys/sysctl.h. r=cjones

ipc/chromium/src/base/debug_util_posix.cc

@@ -20,6 +20,9 @@
 #endif
 
 #if defined(OS_MACOSX) || defined(OS_BSD)
+#if defined(OS_OPENBSD)
+#include <sys/proc.h>
+#endif
 #include <sys/sysctl.h>
 #endif