Fix some users of removed mirror API.

pkg/polymer/lib/src/loader.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.
 
 part of polymer;
 
 /** Annotation used to automatically register polymer elements. */
 class CustomTag {
   final String tagName;
   const CustomTag(this.tagName);
@@ skipping 151 matching lines @@
       lib = canonicalLib;
     }
   }
 
   if (lib == null) {
     print('warning: $uri library not found');
     return;
   }
 
   // Search top-level functions marked with @initMethod
-  for (var f in lib.functions.values) {
+  for (var f in lib.declarations.values.where((d) => d is MethodMirror)) {
     _maybeInvoke(lib, f);
   }
 
-  for (var c in lib.classes.values) {
+  for (var c in lib.declarations.values.where((d) => d is ClassMirror)) {
     // Search for @CustomTag on classes
     for (var m in c.metadata) {
       var meta = m.reflectee;
       if (meta is CustomTag) {
         Polymer.register(meta.tagName, getReflectedTypeWorkaround(c));
       }
     }
 
     // TODO(sigmund): check also static methods marked with @initMethod.
     // This is blocked on two bugs:
@@ skipping 22 matching lines @@
     print("warning: methods marked with @initMethod should take no "
         "arguments, ${method.simpleName} expects some.");
     return;
   }
   obj.invoke(method.simpleName, const []);
 }
 
 class _InitMethodAnnotation {
   const _InitMethodAnnotation();
 }