Remove commented-out subdirectories that were listed purely hypothetically to avoid their confusing people in the future. No bug.

(See bug 859301 comment 56 for an example of the problem this causes.)

--HG--
extra : amend_source : 88cd9b67f4f833f07ac34aeb6483cf83f9b339d3
extra : transplant_source : 0N%B9%D7%D5%91%22%BC%8D%5C%03%FD%E5Z%0C%E1%BF%91X%EA

layout/reftests/w3c-css/submitted/reftest.list

@@ -10,9 +10,6 @@
 # CSS2.1
 include css21/reftest.list
 
-# Animations
-# include animations/reftest.list
-
 # Backgrounds and Borders
 include background/reftest.list
 
@@ -40,18 +37,12 @@ include lists-3/reftest.list
 # Masking Level 1
 include masking/reftest.list
 
-# Media Queries Level 3
-# include mediaqueries3/reftest.list
-
 # Multi-column Layout 3
 include multicol3/reftest.list
 
 # Ruby Layout Module
 include ruby/reftest.list
 
-# Selectors Level 3
-# include selectors3/reftest.list
-
 # Selectors Level 4
 include selectors4/reftest.list
 
@@ -64,9 +55,6 @@ include text-decor-3/reftest.list
 # Transforms
 include transforms/reftest.list
 
-# Transitions
-# include transitions/reftest.list
-
 # User Interface Level 3
 include ui3/reftest.list