Fix type errors in sort().

pkg/dev_compiler/tool/input_sdk/lib/collection/list.dart

Index: pkg/dev_compiler/tool/input_sdk/lib/collection/list.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/lib/collection/list.dart b/pkg/dev_compiler/tool/input_sdk/lib/collection/list.dart
index 7e6dbd3adc18306ba52249a85ea852921eec7a17..9e6924fcc00f14375b567f6520cc7ab07fdfde71 100644
--- a/pkg/dev_compiler/tool/input_sdk/lib/collection/list.dart
+++ b/pkg/dev_compiler/tool/input_sdk/lib/collection/list.dart
@@ -309,7 +309,7 @@ abstract class ListMixin<E> implements List<E> {
 
   void sort([int compare(E a, E b)]) {
     if (compare == null) {
-      Sort.sort(this, Comparable.compare);
+      Sort.sort(this, (a, b) => (a as Comparable).compareTo(b));
     } else {
       Sort.sort(this, compare);
     }