Restructure pkg/unittest and pkg/webdriver to follow the pub conventions.

pkg/dartdoc/test/dartdoc_search_test.dart

Index: pkg/dartdoc/test/dartdoc_search_test.dart
===================================================================
--- pkg/dartdoc/test/dartdoc_search_test.dart	(revision 14313)
+++ pkg/dartdoc/test/dartdoc_search_test.dart	(working copy)
@@ -2,11 +2,11 @@
 // 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('dartdoc_search_test');
+library dartdoc_search_test;
 
 // TODO(rnystrom): Use "package:" URL (#4968).
-#source('../lib/src/dartdoc/nav.dart');
-#source('../lib/src/client/search.dart');
+part '../lib/src/dartdoc/nav.dart';
+part '../lib/src/client/search.dart';
 
 const String URL = 'dummy-url';
 
@@ -49,4 +49,4 @@
 	testTopLevelVsMembers();
 	testTopLevelFullVsPrefix();
 	testMemberFullVsPrefix();
-}
+}