Remove deprecated StringBuffer.add, addAll and addCharCode.

sdk/lib/_internal/compiler/implementation/scanner/byte_strings.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.
 
 /**
  * An abstract string representation.
  */
 abstract class ByteString extends Iterable<int> implements SourceString {
   final List<int> bytes;
   final int offset;
@@ skipping 25 matching lines @@
   int computeHashCode() {
     int code = 1;
     int end = offset + length;
     for (int i = offset; i < end; i++) {
       code += 19 * code + bytes[i];
     }
     return code;
   }
 
   printOn(StringBuffer sb) {
-    sb.add(slowToString());
+    sb.write(slowToString());
   }
 
   bool get isEmpty => length == 0;
   bool isPrivate() => !isEmpty && identical(bytes[offset], $_);
 
   String get stringValue => null;
 }
 
 /**
  * A string that consists purely of 7bit ASCII characters.
@@ skipping 88 matching lines @@
  * A ByteString-valued token.
  */
 class ByteStringToken extends Token {
   final ByteString value;
 
   ByteStringToken(PrecedenceInfo info, ByteString this.value, int charOffset)
     : super(info, charOffset);
 
   String toString() => value.toString();
 }