Bug 820120 - Remove the browser.privatebrowsing.dont_prompt_on_enter pref in per-window private browsing builds; r=jdm

browser/app/profile/firefox.js

@@ -862,8 +862,10 @@ pref("security.alternate_certificate_error_page", "certerror");
 // Whether to start the private browsing mode at application startup
 pref("browser.privatebrowsing.autostart", false);
 
+#ifndef MOZ_PER_WINDOW_PRIVATE_BROWSING
 // Whether we should skip prompting before starting the private browsing mode
 pref("browser.privatebrowsing.dont_prompt_on_enter", false);
+#endif
 
 // Don't try to alter this pref, it'll be reset the next time you use the
 // bookmarking dialog