Use @Native annotation on dart2js DOM native classes

tools/dom/templates/html/impl/impl_ClientRect.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 @DocsEditable()
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS implements Rectangle$IMPLEMENTS$NATIVESPEC {
+$(ANNOTATIONS)$(NATIVESPEC)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS implements Rectangle$IMPLEMENTS {
 
   // NOTE! All code below should be common with RectangleBase.
    String toString() {
     return 'Rectangle ($left, $top) $width x $height';
   }
 
   bool operator ==(other) {
     if (other is !Rectangle) return false;
     return left == other.left && top == other.top && width == other.width &&
         height == other.height;
@@ skipping 108 matching lines @@
     hash = 0x1fffffff & (hash + ((0x03ffffff & hash) <<  3));
     hash = hash ^ (hash >> 11);
     return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
   }
 
   static int hash2(a, b) => finish(combine(combine(0, a), b));
 
   static int hash4(a, b, c, d) =>
       finish(combine(combine(combine(combine(0, a), b), c), d));
 }