Remove deprecated StringBuffer.add, addAll and addCharCode.

sdk/lib/html/html_common/lists.dart

 // Copyright (c) 2011, 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 html_common;
 
 class Lists {
 
   /**
    * Returns the index in the array [a] of the given [element], starting
@@ skipping 55 matching lines @@
     }
     return accumulator;
   }
 
   static String join(List<Object> list, [String separator]) {
     if (list.isEmpty) return "";
     if (list.length == 1) return "${list[0]}";
     StringBuffer buffer = new StringBuffer();
     if (separator == null || separator == "") {
       for (int i = 0; i < list.length; i++) {
-        buffer.add("${list[i]}");
+        buffer.write("${list[i]}");
       }
     } else {
-      buffer.add("${list[0]}");
+      buffer.write("${list[0]}");
       for (int i = 1; i < list.length; i++) {
-        buffer.add(separator);
-        buffer.add("${list[i]}");
+        buffer.write(separator);
+        buffer.write("${list[i]}");
       }
     }
     return buffer.toString();
   }
 }