Add list.removeAt method.

runtime/lib/array.dart

 // Copyright (c) 2012, 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.
 
 
 // TODO(srdjan): Use shared array implementation.
 class ObjectArray<E> implements List<E> {
 
   factory ObjectArray(int length) native "ObjectArray_allocate";
 
   E operator [](int index) native "ObjectArray_getIndexed";
 
   void operator []=(int index, E value) native "ObjectArray_setIndexed";
 
   String toString() {
     return Collections.collectionToString(this);
   }
 
   int get length native "ObjectArray_getLength";
 
   void _copyFromObjectArray(ObjectArray src,
                             int srcStart,
                             int dstStart,
                             int count)
       native "ObjectArray_copyFromObjectArray";
 
+  E removeAt(int index) {
+    throw const UnsupportedOperationException(
+        "Cannot remove element of a non-extendable array");
+  }
+
   void setRange(int start, int length, List<E> from, [int startFrom = 0]) {
     if (length < 0) {
       throw new IllegalArgumentException("negative length $length");
     }
       if (from is ObjectArray) {
       _copyFromObjectArray(from, startFrom, start, length);
     } else {
       Arrays.copy(from, startFrom, this, start, length);
     }
   }
@@ skipping 117 matching lines @@
 
   E operator [](int index) native "ObjectArray_getIndexed";
 
   void operator []=(int index, E value) {
     throw const UnsupportedOperationException(
         "Cannot modify an immutable array");
   }
 
   int get length native "ObjectArray_getLength";
 
+  E removeAt(int index) {
+    throw const UnsupportedOperationException(
+        "Cannot modify an immitable array");
+  }
+
   void copyFrom(List src, int srcStart, int dstStart, int count) {
     throw const UnsupportedOperationException(
         "Cannot modify an immutable array");
   }
 
   void setRange(int start, int length, List<E> from, [int startFrom = 0]) {
     throw const UnsupportedOperationException(
         "Cannot modify an immutable array");
   }
 
@@ skipping 120 matching lines @@
     if (!hasNext()) {
       throw const NoMoreElementsException();
     }
     return _array[_pos++];
   }
 
   final List<E> _array;
   final int _length;  // Cache array length for faster access.
   int _pos;
 }