Removed fixed dependencies

packages/dart_style/test/splitting/lists.stmt

 40 columns                              |
 >>> empty list
 [];
 <<<
 [];
 >>> exactly 40 characters
 [first, second, third, fourth, seventh];
 <<<
 [first, second, third, fourth, seventh];
 >>>
@@ skipping 55 matching lines @@
   () {
     "fn";
   },
   third,
   fourth
 ];
 >>> spaces between items
 [1,2,3,4];
 <<<
 [1, 2, 3, 4];
->>> dangling comma
+>>> trailing comma forces split
 [1 , ];
 <<<
-[1,];
->>> dangling comma multiline
+[
+  1,
+];
+>>> trailing comma multiline
 [first, second, third, fourth, fifth, sixth  , ];
 <<<
 [
   first,
   second,
   third,
   fourth,
   fifth,
   sixth,
 ];
@@ skipping 68 matching lines @@
 ];
 <<<
 [
   element,
 
   // comment
   element,
 
   element
 ];