Add methods to Collection.

sdk/lib/core/list.dart

Index: sdk/lib/core/list.dart
diff --git a/sdk/lib/core/list.dart b/sdk/lib/core/list.dart
index a2c299aceea1c9e9c9a269cb07eface79834812a..37828c79c3a65ca177ed00454220ccf16f7a4cd0 100644
--- a/sdk/lib/core/list.dart
+++ b/sdk/lib/core/list.dart
@@ -304,6 +304,26 @@ abstract class NonExtensibleListMixin<E>
         "Cannot add to an unmodifiable list");
   }
 
+  void remove(E element) {
+    throw new UnsupportedError(
+        "Cannot remove in an unmodifiable list");

[floitsch, 2013/01/17 13:36:58]

remove from ...

[Lasse Reichstein Nielsen, 2013/01/18 11:41:48]

Done.

+  }
+
+  void removeAll(Iterable elements) {
+    throw new UnsupportedError(
+        "Cannot remove in an unmodifiable list");
+  }
+
+  void retainAll(Iterable elements) {
+    throw new UnsupportedError(
+        "Cannot remove in an unmodifiable list");
+  }
+
+  void removeMatching(bool test(E element)) {
+    throw new UnsupportedError(
+        "Cannot remove in an unmodifiable list");
+  }
+
   void sort([Comparator<E> compare]) {
     throw new UnsupportedError(
         "Cannot modify an unmodifiable list");