Back out adding the default theme's makefile, since the braces break creating makefiles on some systems, winding up down the line as compile failure because cairo-features.h doesn't exist

browser/makefiles.sh

@@ -39,7 +39,6 @@ add_makefiles "
 browser/Makefile
 browser/app/Makefile
 browser/app/profile/extensions/Makefile
-browser/app/profile/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/Makefile
 browser/base/Makefile
 browser/components/Makefile
 browser/components/build/Makefile