Move sort to collection-dev and remove coreSort.

sdk/lib/collection/collections.dart

Index: sdk/lib/collection/collections.dart
diff --git a/sdk/lib/collection/collections.dart b/sdk/lib/collection/collections.dart
index d8fff38be0a4fba05de531ae8059a681205de10e..9a34944f72cd30357c10bdbec24f4bab34e11e39 100644
--- a/sdk/lib/collection/collections.dart
+++ b/sdk/lib/collection/collections.dart
@@ -305,6 +305,11 @@ class IterableMixinWorkaround {
     // The generic type is currently lost. It will be fixed with mixins.
     return new SkipWhileIterable(iterable, test);
   }
+
+  static void sortList(List l, int compare(a, b)) {
+    if (compare == null) compare = Comparable.compare;
+    _Sort.sort(l, compare);
+  }
 }
 
 /**