Cleanup of math sources.

corelib/unified/math/math_sources.gypi

Index: corelib/unified/math/math_sources.gypi
diff --git a/corelib/unified/math/math_sources.gypi b/corelib/unified/math/math_sources.gypi
deleted file mode 100644
index dc854da684570c574174c89c14463dd9f2901df2..0000000000000000000000000000000000000000
--- a/corelib/unified/math/math_sources.gypi
+++ /dev/null
@@ -1,10 +0,0 @@
-# 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.
-
-{
-  'sources': [
-    'base.dart',
-    'random.dart',
-  ],
-}