Remove default value for gfx.downloadable_fonts.enforce_same_site_origin pref, which is no longer implemented. (Bug 457825) r=jdaggett

modules/libpref/src/init/all.js

@@ -149,7 +149,6 @@ pref("gfx.color_management.display_profile", "");
 pref("gfx.color_management.rendering_intent", 0);
 
 pref("gfx.downloadable_fonts.enabled", true);
-pref("gfx.downloadable_fonts.enforce_same_site_origin", true);
 
 pref("accessibility.browsewithcaret", false);
 pref("accessibility.warn_on_browsewithcaret", true);