Add methods to Collection.

runtime/lib/growable_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.
 
 class _GrowableObjectArray<T> implements List<T> {
   factory _GrowableObjectArray._uninstantiable() {
     throw new UnsupportedError(
         "GrowableObjectArray can only be allocated by the VM");
   }
 
   T removeAt(int index) {
     if (index is! int) throw new ArgumentError(index);
     T result = this[index];
     int newLength = this.length - 1;
     Arrays.copy(this,
                 index + 1,
                 this,
                 index,
                 newLength - index);
     this.length = newLength;
     return result;
   }
 
+  void remove(Object element) {
+    for (int i = 0; i < this.length; i++) {
+      if (this[i] == element) {
+        int newLength = this.length - 1;
+        Arrays.copy(this,
+                    index + 1,
+                    this,
+                    index,
+                    newLength - index);
+        this.length = newLength;
+        return;
+      }
+    }
+  }
+
   void setRange(int start, int length, List<T> from, [int startFrom = 0]) {
     if (length < 0) {
       throw new ArgumentError("negative length $length");
     }
     Arrays.copy(from, startFrom, this, start, length);
   }
 
   void removeRange(int start, int length) {
     if (length == 0) {
       return;
@@ skipping 256 matching lines @@
   }
 
   List<T> toList() {
     return new List<T>.from(this);
   }
 
   Set<T> toSet() {
     return new Set<T>.from(this);
   }
 }