Bug 1336398 - Enable 4 content processes on Nightly. r=krizsa

MozReview-Commit-ID: 55Dtg3fl6oP

--HG--
extra : rebase_source : af9622ef8a8362f3f5faf4efd24e07059c301f8b

modules/libpref/init/all.js

@@ -2909,7 +2909,7 @@ pref("dom.ipc.plugins.forcedirect.enabled", true);
 #endif
 
 #ifdef NIGHTLY_BUILD
-pref("dom.ipc.processCount", 2);
+pref("dom.ipc.processCount", 4);
 #else
 pref("dom.ipc.processCount", 1);
 #endif