Remove leftover file in lib/crypto directory.

sdk/lib/crypto/crypto_sources.gypi

Index: sdk/lib/crypto/crypto_sources.gypi
diff --git a/sdk/lib/crypto/crypto_sources.gypi b/sdk/lib/crypto/crypto_sources.gypi
deleted file mode 100644
index 8d9fbd89ceb7356a57605362f5bff33b8d3d1d97..0000000000000000000000000000000000000000
--- a/sdk/lib/crypto/crypto_sources.gypi
+++ /dev/null
@@ -1,17 +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.
-
-# This file contains all sources for the dart:crypto library.
-{
-  'sources': [
-    'crypto.dart',
-    # The above file needs to be first as it lists the parts below.
-    'crypto_utils.dart',
-    'hash_utils.dart',
-    'hmac.dart',
-    'md5.dart',
-    'sha1.dart',
-    'sha256.dart',
-  ],
-}