Remove deprecated string features.

utils/pub/utils.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.
 
 /// Generic utility functions. Stuff that should possibly be in core.
 library utils;
 
 import 'dart:async';
 import 'dart:crypto';
 import 'dart:isolate';
@@ skipping 123 matching lines @@
 bool endsWithPattern(String str, Pattern matcher) {
   for (var match in matcher.allMatches(str)) {
     if (match.end == str.length) return true;
   }
   return false;
 }
 
 /// Returns the hex-encoded sha1 hash of [source].
 String sha1(String source) {
   var sha = new SHA1();
-  sha.add(source.charCodes);
+  sha.add(source.codeUnits);
   return CryptoUtils.bytesToHex(sha.close());
 }
 
 /// Invokes the given callback asynchronously. Returns a [Future] that completes
 /// to the result of [callback].
 ///
 /// This is also used to wrap synchronous code that may thrown an exception to
 /// ensure that methods that have both sync and async code only report errors
 /// asynchronously.
 Future defer(callback()) {
@@ skipping 180 matching lines @@
 
 /// Add all key/value pairs from [source] to [destination], overwriting any
 /// pre-existing values.
 void mapAddAll(Map destination, Map source) =>
   source.forEach((key, value) => destination[key] = value);
 
 /// Decodes a URL-encoded string. Unlike [decodeUriComponent], this includes
 /// replacing `+` with ` `.
 String urlDecode(String encoded) =>
   decodeUriComponent(encoded.replaceAll("+", " "));