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

pkg/dartdoc/test/dartdoc_search_test.dart

 // Copyright (c) 2012, 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('dartdoc_search_test');
 
 // TODO(rnystrom): Use "package:" URL (#4968).
 #source('../lib/src/dartdoc/nav.dart');
 #source('../lib/src/client/search.dart');
 
@@ skipping 31 matching lines @@
         // Matching a member field 'cancelable' in 'Event';
         var prefixResult = new Result(prefixMatch, FIELD, URL, type: 'Event');
         Expect.equals(-1, resultComparator(fullResult, prefixResult),
                 "Full matches should be preferred to prefix matches");
 }
 
 void main() {
         testTopLevelVsMembers();
         testTopLevelFullVsPrefix();
         testMemberFullVsPrefix();
-}
+}