Removed fixed dependencies

packages/dart_style/test/regression/0400/0481.unit

+>>>
+class Car extends Vehicle with Doors, Windows, Wheels, Tires,
+    Motor, Hood, Trunk, Roof, Pedals, Gas, Seats, LotsOfFun {
+  // ...
+}
+<<<
+class Car extends Vehicle
+    with
+        Doors,
+        Windows,
+        Wheels,
+        Tires,
+        Motor,
+        Hood,
+        Trunk,
+        Roof,
+        Pedals,
+        Gas,
+        Seats,
+        LotsOfFun {
+  // ...
+}