Fix normalization of relative paths inside of deep relative imports

test/custom_element_test.dart

 // Copyright (c) 2015, 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.
 library web_components.test.custom_element_test;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:initialize/initialize.dart' as init;
 import 'package:unittest/html_config.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 57 matching lines @@
       // why? https://github.com/dart-lang/web-components/issues/4
       return new Future(() {}).then((_) {
         var elements = container.querySelectorAll('child-element');
         expect(elements.length, 2);
         for (var element in elements) {
           expect(element is ChildElement, isTrue);
         }
       });
     });
 
-
     test('extends input element', () {
       expect(document.querySelector('input') is ExtendedElement, isTrue);
       container.append(new ExtendedElement());
       container.appendHtml('<input is="extended-element" />');
       // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
       // why? https://github.com/dart-lang/web-components/issues/4
       return new Future(() {}).then((_) {
         var elements = container.querySelectorAll('input');
         expect(elements.length, 2);
         for (var element in elements) {
           expect(element is ExtendedElement, isTrue);
         }
       });
     });
   });
 }