Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

runtime/tests/vm/dart/isolate_mirror_local_test.dart

Index: runtime/tests/vm/dart/isolate_mirror_local_test.dart
diff --git a/runtime/tests/vm/dart/isolate_mirror_local_test.dart b/runtime/tests/vm/dart/isolate_mirror_local_test.dart
index 9ca608ad4ac9bd3fa05a619e499c561a4855bbe9..e72f5a138f6071d23383bef3892205a2ce081ec5 100644
--- a/runtime/tests/vm/dart/isolate_mirror_local_test.dart
+++ b/runtime/tests/vm/dart/isolate_mirror_local_test.dart
@@ -308,7 +308,7 @@ void testLibrariesMap(Map libraries) {
   Expect.equals('Object', list_intf.superclass.simpleName);
   Expect.equals('dart.core', list_intf.owner.simpleName);
   Expect.isTrue(list_intf.isClass);
-  Expect.equals('Collection', list_intf.superinterfaces[0].simpleName);
+  Expect.equals('Iterable', list_intf.superinterfaces[0].simpleName);
   Expect.equals("ClassMirror on 'List'", list_intf.toString());
 
   // Lookup a class from a library and make sure it is sane.