Make List.skip, List.take and List.reversed return Iterables, not Lists.

pkg/analyzer-experimental/lib/src/generated/java_core.dart

 library java.core;
 
 import "dart:math" as math;
 
 class System {
   static int currentTimeMillis() {
     return (new Date.now()).millisecondsSinceEpoch;
   }
 }
 
@@ skipping 239 matching lines @@
   }
 
   E removeAt(int index) {
     return elements.removeAt(index);
   }
 
   E removeLast() {
     return elements.removeLast();
   }
 
-  List<E> get reversed => elements.reversed;
+  Iterable<E> get reversed => elements.reversed;
 
   List<E> getRange(int start, int length) {
     return elements.getRange(start, length);
   }
 
   void setRange(int start, int length, List<E> from, [int startFrom]) {
     elements.setRange(start, length, from, startFrom);
   }
 
   void removeRange(int start, int length) {
@@ skipping 20 matching lines @@
   });
   return result;
 }
 
 bool javaSetAdd(Set s, o) {
   if (!s.contains(o)) {
     s.add(o);
     return true;
   }
   return false;
-}
+}