Removed fixed dependencies

packages/dart_style/test/splitting/maps.stmt

 40 columns                              |
 >>> empty map
 var m = { };
 <<<
 var m = {};
 >>> exactly 40 characters
 var m = {first: second, third: forth__};
 <<<
 var m = {first: second, third: forth__};
 >>>
@@ skipping 56 matching lines @@
   first: one /* bang */,
   second: two
 };
 >>> const
 var map = const {"foo": "bar", "fuz": null};
 <<<
 var map = const {
   "foo": "bar",
   "fuz": null
 };
->>> dangling comma
+>>> trailing comma forces split
 var map = {"foo": "bar" , };
 <<<
-var map = {"foo": "bar",};
->>> dangling comma multiline
+var map = {
+  "foo": "bar",
+};
+>>> trailing comma multiline
 var map = {"foo": "bar", "fuzzy": null , };
 <<<
 var map = {
   "foo": "bar",
   "fuzzy": null,
 };
 >>> preserve newlines in maps containing a line comment
 var map = {
   // yeah
   a:b,c:d,
@@ skipping 59 matching lines @@
 >>> ignore newlines between keys and values
 var map = {// comment
 a:
 value
 };
 <<<
 var map = {
   // comment
   a: value
 };