Remove dynamic call from _LinkedHashSet. Remove some dcalls from the dart:html util library.

pkg/dev_compiler/tool/input_sdk/patch/collection_patch.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 file for dart:collection classes.
 import 'dart:_foreign_helper' show JS;
 import 'dart:_js_helper' show
     fillLiteralMap, InternalMap, NoInline, NoSideEffects, NoThrows, patch,
     JsLinkedHashMap, LinkedHashMapCell, LinkedHashMapKeyIterable,
     LinkedHashMapKeyIterator;
@@ skipping 1588 matching lines @@
   E _element;
 
   _LinkedHashSetCell<E> _next;
   _LinkedHashSetCell<E> _previous;
 
   _LinkedHashSetCell(this._element);
 }
 
 // TODO(kasperl): Share this code with LinkedHashMapKeyIterator<E>?
 class _LinkedHashSetIterator<E> implements Iterator<E> {
-  final _set;
+  final _LinkedHashSet _set;
   final int _modifications;
   _LinkedHashSetCell _cell;
   E _current;
 
   _LinkedHashSetIterator(this._set, this._modifications) {
     _cell = _set._first;
   }
 
   E get current => _current;
 
   bool moveNext() {
     if (_modifications != _set._modifications) {
       throw new ConcurrentModificationError(_set);
     } else if (_cell == null) {
       _current = null;
       return false;
     } else {
       _current = _cell._element;
       _cell = _cell._next;
       return true;
     }
   }
 }