Remove deprecated StringBuffer.add, addAll and addCharCode.

sdk/lib/core/expect.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.
 
 part of dart.core;
 
 /**
  * This class is *deprecated*.
  *
  * Expect is used for tests that do not want to make use of the
@@ skipping 234 matching lines @@
     missingSet.removeAll(actual);
     final extraSet = new Set.from(actual);
     extraSet.removeAll(expected);
 
     if (extraSet.isEmpty && missingSet.isEmpty) return;
     String msg = _getMessage(reason);
 
     StringBuffer sb = new StringBuffer("Expect.setEquals($msg) fails");
     // Report any missing items.
     if (!missingSet.isEmpty) {
-      sb.add('\nExpected collection does not contain: ');
+      sb.write('\nExpected collection does not contain: ');
     }
 
     for (final val in missingSet) {
-      sb.add('$val ');
+      sb.write('$val ');
     }
 
     // Report any extra items.
     if (!extraSet.isEmpty) {
-      sb.add('\nExpected collection should not contain: ');
+      sb.write('\nExpected collection should not contain: ');
     }
 
     for (final val in extraSet) {
-      sb.add('$val ');
+      sb.write('$val ');
     }
     _fail(sb.toString());
   }
 
   /**
    * Calls the function [f] and verifies that it throws an exception.
    * The optional [check] function can provide additional validation
    * that the correct exception is being thrown.  For example, to check
    * the type of the exception you could write this:
    *
@@ skipping 29 matching lines @@
 bool _identical(a, b) => identical(a, b);
 
 typedef bool _CheckExceptionFn(exception);
 
 @deprecated
 class ExpectException implements Exception {
   ExpectException(this.message);
   String toString() => message;
   String message;
 }