Remove deprecated StringBuffer.add, addAll and addCharCode.

samples/swarm/swarm_ui_lib/view/MeasureText.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 view;
 
 // TODO(jacobr): handle splitting lines on symbols such as '-' that aren't
 // whitespace but are valid word breaking points.
 /**
  * Utility class to efficiently word break and measure text without requiring
@@ skipping 85 matching lines @@
       if (lines == maxLines) {
         // Overflow case... there may be more lines of text than we can handle.
         // Add a few characters to the last line so that the browser will
         // render ellipses correctly.
         // TODO(jacobr): make this optional and only add characters until
         // the first whitespace character encountered.
         end = Math.min(end + 50, text.length);
       }
       if (sb != null) {
         if (lines > 1) {
-          sb.add('<br>');
+          sb.write('<br>');
         }
         // TODO(jacobr): HTML escape this text.
-        sb.add(text.substring(start, end));
+        sb.write(text.substring(start, end));
       }
     });
     return lines;
   }
 
   void lineBreak(String text, num lineWidth, int maxLines,
                  Function callback) {
     _context.font = font;
     int lines = 0;
     num currentLength = 0;
@@ skipping 34 matching lines @@
       } else if (wordStartIndex == null && !whitespace) {
         wordStartIndex = i;
       }
       lastWhitespace = whitespace;
     }
     if (currentLength > 0) {
       callback(startIndex, text.length, currentLength);
     }
   }
 }