SDK fixes

tool/input_sdk/lib/collection/list.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.collection;
 
 /**
  * Abstract implementation of a list.
  *
  * `ListBase` can be used as a base class for implementing the `List` interface.
@@ skipping 284 matching lines @@
   E removeLast() {
     if (length == 0) {
       throw IterableElementError.noElement();
     }
     E result = this[length - 1];
     length--;
     return result;
   }
 
   void sort([int compare(E a, E b)]) {
-    if (compare == null) {
-      var defaultCompare = Comparable.compare;
-      compare = defaultCompare;
-    }
-    Sort.sort(this, compare);
+    Sort.sort(this, compare == null ? Comparable.compare : compare);
   }
 
   void shuffle([Random random]) {
     if (random == null) random = new Random();
     int length = this.length;
     while (length > 1) {
       int pos = random.nextInt(length);
       length -= 1;
       var tmp = this[length];
       this[length] = this[pos];
@@ skipping 175 matching lines @@
       for (E element in iterable) {
         this[index++] = element;
       }
     }
   }
 
   Iterable<E> get reversed => new ReversedListIterable<E>(this);
 
   String toString() => IterableBase.iterableToFullString(this, '[', ']');
 }