Update unittest to new package layout.

tests/html/websql_test.dart

 #library('WebDBTest');
-#import('../../pkg/unittest/unittest.dart');
-#import('../../pkg/unittest/html_config.dart');
+#import('../../pkg/unittest/lib/unittest.dart');
+#import('../../pkg/unittest/lib/html_config.dart');
 #import('dart:html');
 
 void fail(message) {
   guardAsync(() {
       Expect.fail(message);
     });
 }
 
 Future<SQLTransaction> createTransaction(Database db) {
   final completer = new Completer<SQLTransaction>();
@@ skipping 93 matching lines @@
           Expect.equals(1, resultSet.rows.length);
           var row = resultSet.rows.item(0);
           Expect.isTrue(row.containsKey(columnName));
           Expect.equals('Some text data', row[columnName]);
         });
       }))
       .chain(dropTable(tableName))
       .then(expectAsync1((tx) {}));
   });
 }