Remove deprecated StringBuffer.add, addAll and addCharCode.

sdk/lib/_internal/dartdoc/lib/src/client/client-live-nav.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.
 
 /** Provides client-side behavior for generated docs. */
 library client;
 
 import 'dart:html';
 import 'dart:json' as jsonlib;
 import '../../../../compiler/implementation/source_file.dart';
@@ skipping 19 matching lines @@
 
 /**
  * Takes [libraries], a JSON array representing a set of libraries and builds
  * the appropriate navigation DOM for it relative to the current library and
  * type.
  */
 buildNavigation(List libraries) {
   final html = new StringBuffer();
   for (Map libraryInfo in libraries) {
     String libraryName = libraryInfo[NAME];
-    html.add('<h2><div class="icon-library"></div>');
+    html.write('<h2><div class="icon-library"></div>');
     if (currentLibrary == libraryName && currentType == null) {
-      html.add('<strong>${md.escapeHtml(libraryName)}</strong>');
+      html.write('<strong>${md.escapeHtml(libraryName)}</strong>');
     } else {
       final url = getLibraryUrl(libraryName);
-      html.add('<a href="$url">${md.escapeHtml(libraryName)}</a>');
+      html.write('<a href="$url">${md.escapeHtml(libraryName)}</a>');
     }
-    html.add('</h2>');
+    html.write('</h2>');
 
     // Only list the types for the current library.
     if (currentLibrary == libraryName && libraryInfo.containsKey(TYPES)) {
       buildLibraryNavigation(html, libraryInfo);
     }
   }
 
   // Insert it into the DOM.
   final navElement = document.query('.nav');
   navElement.innerHtml = html.toString();
@@ skipping 10 matching lines @@
     if (name.endsWith('Exception') || name.endsWith('Error')) {
       exceptions.add(typeInfo);
     } else {
       types.add(typeInfo);
     }
   }
 
   if (types.length == 0 && exceptions.length == 0) return;
 
   writeType(String icon, Map typeInfo) {
-    html.add('<li>');
+    html.write('<li>');
     if (currentType == typeInfo[NAME]) {
-      html.add(
+      html.write(
           '<div class="icon-$icon"></div><strong>${getTypeName(typeInfo)}</strong>');
     } else {
-      html.add(
+      html.write(
           '''
           <a href="${getTypeUrl(currentLibrary, typeInfo)}">
             <div class="icon-$icon"></div>${getTypeName(typeInfo)}
           </a>
           ''');
     }
-    html.add('</li>');
+    html.write('</li>');
   }
 
-  html.add('<ul class="icon">');
+  html.write('<ul class="icon">');
   types.forEach((typeInfo) =>
       writeType(kindToString(typeInfo[KIND]), typeInfo));
   exceptions.forEach((typeInfo) => writeType('exception', typeInfo));
-  html.add('</ul>');
+  html.write('</ul>');
 }