Bug 1103733 - Enable EME on non-release builds; r=cpearce

browser/app/profile/firefox.js

@@ -1742,7 +1742,11 @@ pref("ui.key.menuAccessKeyFocuses", true);
 #endif
 
 // Encrypted media extensions.
+#ifdef RELEASE_BUILD
 pref("media.eme.enabled", false);
+#else
+pref("media.eme.enabled", true);
+#endif
 
 // GMPInstallManager prefs