Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

tools/dom/templates/immutable_list_mixin.darttemplate

   // -- start List<$E> mixins.
   // $E is the element type.
 
   // From Iterable<$E>:
 
   Iterator<$E> get iterator {
     // Note: NodeLists are not fixed size. And most probably length shouldn't
     // be cached in both iterator _and_ forEach method. For now caching it
     // for consistency.
     return new FixedSizeListIterator<$E>(this);
@@ skipping 137 matching lines @@
   }
 
   $E removeLast() {
     throw new UnsupportedError("Cannot remove from immutable List.");
   }
 
   void remove(Object object) {
     throw new UnsupportedError("Cannot remove from immutable List.");
   }
 
-  void removeAll(Iterable elements) {
-    throw new UnsupportedError("Cannot remove from immutable List.");
-  }
-
-  void retainAll(Iterable elements) {
-    throw new UnsupportedError("Cannot remove from immutable List.");
-  }
-
   void removeWhere(bool test($E element)) {
     throw new UnsupportedError("Cannot remove from immutable List.");
   }
 
   void retainWhere(bool test($E element)) {
     throw new UnsupportedError("Cannot remove from immutable List.");
   }
 
   void setRange(int start, int rangeLength, List<$E> from, [int startFrom]) {
     throw new UnsupportedError("Cannot setRange on immutable List.");
@@ skipping 19 matching lines @@
     IterableMixinWorkaround.asMapList(this);
 
   String toString() {
     StringBuffer buffer = new StringBuffer('[');
     buffer.writeAll(this, ', ');
     buffer.write(']');
     return buffer.toString();
   }
 
   // -- end List<$E> mixins.