Remove obsolete version of dromaeo

lib/html/benchmarks/common/common.lib

Index: lib/html/benchmarks/common/common.lib
diff --git a/lib/html/benchmarks/common/common.lib b/lib/html/benchmarks/common/common.lib
deleted file mode 100644
index c31a1dbaa5d7e500d36812af8e2d8f633f25f760..0000000000000000000000000000000000000000
--- a/lib/html/benchmarks/common/common.lib
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright (c) 2011, 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 {
-  source = [
-    'BenchUtil.dart',
-    'Interval.dart',
-    'JSON.dart',
-    'Math2.dart'
-  ]
-}