Removed fixed dependencies

packages/dart_style/test/splitting/arguments.stmt

 40 columns                              |
 >>> many arguments
 method(first, second, third, fourth, fifth, sixth, seventh, eighth, ninth,
     tenth, eleventh, twelfth);
 <<<
 method(
     first,
     second,
     third,
     fourth,
@@ skipping 46 matching lines @@
     a,
     b,
     inner(veryLongArgument,
         veryLongArgument),
     c);
 >>> do not force single-argument list to split if argument splits
 foo(inner(veryLongArgument, veryLongArgument));
 <<<
 foo(inner(veryLongArgument,
     veryLongArgument));
+>>> do force named single-argument list to split if argument splits
+foo(named:inner(veryLongArgument, veryLongArgument));
+<<<
+foo(
+    named: inner(veryLongArgument,
+        veryLongArgument));
 >>> do not split empty argument list
 foo___________________________________();
 <<<
 foo___________________________________();
 >>> do split empty argument list if it contains a comment
 foo___________________________________(/* */);
 <<<
 foo___________________________________(
     /* */);
 >>> keep positional and named on first line
@@ skipping 110 matching lines @@
       element,
       element
     ],
     argument,
     {
       'key': value,
       'other key': value,
       'third key': value
     }, () {
   ;
-});
+});
+>>> trailing comma
+fn(argument,argument  ,argument  ,  );
+<<<
+fn(
+  argument,
+  argument,
+  argument,
+);
+>>> trailing comma in named argument list
+fn(named: argument,another:argument,  );
+<<<
+fn(
+  named: argument,
+  another: argument,
+);