Issue #1053 - Part 2b: Remove android from /layout reftests

Also cleans up some other obsolete checks and stylo reftest lists.

layout/reftests/reftest.list

@@ -251,8 +251,7 @@ include margin-collapsing/reftest.list
 include marquee/reftest.list
 
 # native-theme/
-# (no XUL theme on Android)
-skip-if(Android) include native-theme/reftest.list
+include native-theme/reftest.list
 
 # netwerk/
 include ../../netwerk/test/reftest/reftest.list
@@ -379,17 +378,17 @@ include ../../widget/reftests/reftest.list
 # xml-stylesheet/
 include ../../dom/tests/reftest/xml-stylesheet/reftest.list
 
-# xul-document-load/ (no XUL theme on Android)
-skip-if(Android) include xul-document-load/reftest.list
+# xul-document-load/
+include xul-document-load/reftest.list
 
-# xul/ (no XUL theme on Android)
-skip-if(Android) include xul/reftest.list
+# xul/
+include xul/reftest.list
 
-# xul (no XUL theme on Android)
-skip-if(Android) include ../xul/reftest/reftest.list
+# xul
+include ../xul/reftest/reftest.list
 
-# xul grid (no XUL theme on Android)
-skip-if(Android) include ../xul/grid/reftests/reftest.list
+# xul grid
+include ../xul/grid/reftests/reftest.list
 
 # -webkit-box & associated properties (mapped to modern flexbox)
 include webkit-box/reftest.list