Implement removeRange, and update some documentation on the list interface.

runtime/lib/growable_array.dart

 // Copyright (c) 2011, 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 Array<T> {
   Array<T> backingArray;
 
   void copyFrom(Array<Object> src, int srcStart, int dstStart, int count) {
     Arrays.copy(src, srcStart, this, dstStart, count);
   }
 
   void setRange(int start, int length, List<T> from, [int startFrom = 0]) {
+    if (length < 0) throw new IllegalArgumentException(length);
     Arrays.copy(from, startFrom, this, start, length);
   }
 
   void removeRange(int start, int length) {
-    throw const NotImplementedException();
+    if (length == 0) {
+      return;
+    }
+    if (length < 0) {
+      throw const IllegalArgumentException();
+    }
+    if (start < 0 || start >= this.length) {
+      throw new IndexOutOfRangeException(start);
+    }
+    if (start + length > this.length) {
+      throw new IndexOutOfRangeException(start + length);
+    }
+    Arrays.copy(backingArray,
+                start + length,
+                backingArray,
+                start,
+                this.length - length - start);
+    this.length = this.length - length;
   }
 
   void insertRange(int start, int length, [T initialValue = null]) {
     throw const NotImplementedException();
   }
 
   List<T> getRange(int start, int length) {
     throw const NotImplementedException();
   }
 
@@ skipping 161 matching lines @@
     if (!hasNext()) {
       throw const NoMoreElementsException();
     }
     return _array[_pos++];
   }
 
   final GrowableObjectArray<T> _array;
   int _pos;
 }