Make the crypto library an official dart:crypto library.

tests/lib/crypto/hmac_md5_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('hmac_md5_test');
 
-// TODO(ager): Replace with "dart:crypto" when ready.
-#import("../../../lib/crypto/crypto.dart");
+#import("dart:crypto");
 
 // Data from http://tools.ietf.org/html/rfc2202.
 var hmac_md5_inputs =
     const [
       const [ 0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 ],
       const [ 0x77, 0x68, 0x61, 0x74, 0x20, 0x64, 0x6f, 0x20, 0x79, 0x61,
               0x20, 0x77, 0x61, 0x6e, 0x74, 0x20, 0x66, 0x6f, 0x72, 0x20,
               0x6e, 0x6f, 0x74, 0x68, 0x69, 0x6e, 0x67, 0x3f ],
       const [ 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
               0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
@@ skipping 64 matching lines @@
 void testStandardVectors(inputs, keys, macs) {
   for (var i = 0; i < inputs.length; i++) {
     var d = new HMAC(new MD5(), keys[i]).update(inputs[i]).digest();
     Expect.isTrue(CryptoUtils.bytesToHex(d).startsWith(macs[i]), '$i');
   }
 }
 
 void main() {
   testStandardVectors(hmac_md5_inputs, hmac_md5_keys, hmac_md5_macs);
 }