Bug 1337283 - Unbreak FreeBSD build after bug 1303096. r=blassey

MozReview-Commit-ID: InIrBZboYtv

--HG--
extra : rebase_source : 9dec1625cc95aa6d078e156c2ac45b5acec0e4ae

dom/ipc/ContentParent.cpp

@@ -187,6 +187,7 @@
 #include "nsLayoutStylesheetCache.h"
 
 #include "ContentPrefs.h"
+#include "mozilla/Sprintf.h"
 
 #ifdef MOZ_WEBRTC
 #include "signaling/src/peerconnection/WebrtcGlobalParent.h"