Clean up package imports and library names

pkg/analyzer/test/src/task/html_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 test.src.task.html_test;
+library analyzer.test.src.task.html_test;
 
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/html.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/html.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:html/dom.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
@@ skipping 343 matching lines @@
       expect(bodyElement.localName, 'body');
       // actual nodes
       expect(bodyElement.nodes, hasLength(4));
       expect((bodyElement.nodes[0] as Element).localName, 'div');
       expect((bodyElement.nodes[2] as Element).localName, 'span');
     }
     // it's OK to don't have DOCTYPE
     expect(outputs[HTML_DOCUMENT_ERRORS], isEmpty);
   }
 }