Remove library dart:crypto

tests/lib/crypto/base64_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 tag to allow the test to run on Dartium.
 library base64_test;
 
 import "package:expect/expect.dart";
-import 'dart:crypto';
+import "package:crypto/crypto.dart";
 import 'dart:math';
 
 // Data from http://tools.ietf.org/html/rfc4648.
 var inputs =
     const [ '', 'f', 'fo', 'foo', 'foob', 'fooba', 'foobar'];
 var results =
     const [ '', 'Zg==', 'Zm8=', 'Zm9v', 'Zm9vYg==', 'Zm9vYmE=', 'Zm9vYmFy'];
 
 // Test data with only zeroes.
 var inputsWithZeroes = [[0, 0, 0], [0, 0], [0], []];
@@ skipping 125 matching lines @@
 }
 
 void main() {
   testEncoder();
   testDecoder();
   testDecoderForMalformedInput();
   testEncodeDecodeLists();
   testUrlSafeEncodeDecode();
   testPerformance();
 }