pkg/analyzer: support latest pkg/crypto version

pkg/analyzer/lib/src/summary/summarize_elements.dart

 // Copyright (c) 2015, 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 serialization.elements;
 
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 import 'package:analyzer/src/dart/element/member.dart';
 import 'package:analyzer/src/dart/element/type.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/utilities_dart.dart';
 import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/name_filter.dart';
 import 'package:analyzer/src/summary/summarize_const_expr.dart';
+import 'package:convert/convert.dart';
 import 'package:crypto/crypto.dart';
 import 'package:path/path.dart' as path;
 
 /**
  * Serialize all the elements in [lib] to a summary using [ctx] as the context
  * for building the summary, and using [typeProvider] to find built-in types.
  */
 LibrarySerializationResult serializeLibrary(
     LibraryElement lib, TypeProvider typeProvider, bool strongMode) {
   _LibrarySerializer serializer =
@@ skipping 173 matching lines @@
     _unlinkedUnits.addAll(libraryResult.unlinkedUnits);
     for (Source source in libraryResult.unitSources) {
       _unlinkedUnitHashes.add(_hash(source.contents.data));
     }
   }
 
   /**
    * Compute a hash of the given file contents.
    */
   String _hash(String contents) {
-    MD5 md5 = new MD5();
-    md5.add(UTF8.encode(contents));
-    return CryptoUtils.bytesToHex(md5.close());
+    return hex.encode(md5.convert(UTF8.encode(contents)).bytes);
   }
 }
 
 /**
  * Instances of this class keep track of intermediate state during
  * serialization of a single compilation unit.
  */
 class _CompilationUnitSerializer {
   /**
    * The [_LibrarySerializer] which is serializing the library of which
@@ skipping 1421 matching lines @@
       exportNames.add(new LinkedExportNameBuilder(
           name: name,
           dependency: serializeDependency(dependentLibrary),
           unit: unit,
           kind: kind));
     }
     pb.exportNames = exportNames;
     return pb;
   }
 }