Make List.remove return boolean.

runtime/lib/typeddata.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.
 
 // patch classes for Int8List ..... Float64List and ByteData implementations.
 
 patch class Int8List {
   /* patch */ factory Int8List(int length) {
     return new _Int8Array(length);
   }
@@ skipping 355 matching lines @@
   void add(value) {
     throw new UnsupportedError(
         "Cannot add to a non-extendable array");
   }
 
   void addAll(Iterable value) {
     throw new UnsupportedError(
         "Cannot add to a non-extendable array");
   }
 
+  void insert(int index, value) {
+    throw new UnsupportedError(
+        "Cannot insert into a non-extendable array");
+  }
+
+  void insertAll(int index, Iterable values) {
+    throw new UnsupportedError(
+        "Cannot insert into a non-extendable array");
+  }
+
   void sort([int compare(var a, var b)]) {
     return IterableMixinWorkaround.sortList(this, compare);
   }
 
   int indexOf(element, [int start = 0]) {
     return IterableMixinWorkaround.indexOfList(this, element, start);
   }
 
   int lastIndexOf(element, [int start = null]) {
     return IterableMixinWorkaround.lastIndexOfList(this, element, start);
   }
 
   void clear() {
     throw new UnsupportedError(
         "Cannot remove from a non-extendable array");
   }
 
   int removeLast() {
     throw new UnsupportedError(
         "Cannot remove from a non-extendable array");
   }
 
-  void remove(Object element) {
+  bool remove(Object element) {
     throw new UnsupportedError(
         "Cannot remove from a non-extendable array");
   }
+
+  bool removeAt(int index) {
+    throw new UnsupportedError(
+        "Cannot remove from a non-extendable array");
+  }
 
   void removeAll(Iterable elements) {
     throw new UnsupportedError(
         "Cannot remove from a non-extendable array");
   }
 
   void retainAll(Iterable elements) {
     throw new UnsupportedError(
         "Cannot remove from a non-extendable array");
   }
@@ skipping 2770 matching lines @@
     return value;
   }
   return object;
 }
 
 
 void _throwRangeError(int index, int length) {
   String message = "$index must be in the range [0..$length)";
   throw new RangeError(message);
 }