Remove deprecated StringBuffer.add, addAll and addCharCode.

sdk/lib/uri/encode_decode.dart

 // Copyright (c) 2013, 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.uri;
 
 /**
  * Javascript-like URI encode/decode functions.
  * The documentation here borrows heavily from the original Javascript
  * doumentation on MDN at:
@@ skipping 98 matching lines @@
  * It encodes all characters in the string [text] except for those
  * that appear in [canonicalTable], and returns the escaped string.
  */
 String _uriEncode(List<int> canonicalTable, String text) {
   final String hex = '0123456789ABCDEF';
   var byteToHex = (int v) => '%${hex[v >> 4]}${hex[v & 0x0f]}';
   StringBuffer result = new StringBuffer();
   for (int i = 0; i < text.length; i++) {
     int ch = text.codeUnitAt(i);
     if (ch < 128 && ((canonicalTable[ch >> 4] & (1 << (ch & 0x0f))) != 0)) {
-      result.add(text[i]);
+      result.write(text[i]);
     } else if (text[i] == " ") {
-      result.add("+");
+      result.write("+");
     } else {
       if (ch >= 0xD800 && ch < 0xDC00) {
         // Low surrogate. We expect a next char high surrogate.
         ++i;
         int nextCh = text.length == i ? 0 : text.codeUnitAt(i);
         if (nextCh >= 0xDC00 && nextCh < 0xE000) {
           // convert the pair to a U+10000 codepoint
           ch = 0x10000 + ((ch - 0xD800) << 10) + (nextCh - 0xDC00);
         } else {
           throw new ArgumentError('Malformed URI');
         }
       }
       for (int codepoint in codepointsToUtf8([ch])) {
-        result.add(byteToHex(codepoint));
+        result.write(byteToHex(codepoint));
       }
     }
   }
   return result.toString();
 }
 
 /**
  * Convert a byte (2 character hex sequence) in string [s] starting
  * at position [pos] to its ordinal value
  */
@@ skipping 20 matching lines @@
  * A JavaScript-like decodeURI function. It unescapes the string [text] and
  * returns the unescaped string.
  */
 String _uriDecode(String text) {
   StringBuffer result = new StringBuffer();
   List<int> codepoints = new List<int>();
   for (int i = 0; i < text.length;) {
     String ch = text[i];
     if (ch != '%') {
       if (ch == '+') {
-        result.add(" ");
+        result.write(" ");
       } else {
-        result.add(ch);
+        result.write(ch);
       }
       i++;
     } else {
       codepoints.clear();
       while (ch == '%') {
         if (++i > text.length - 2) {
           throw new ArgumentError('Truncated URI');
         }
         codepoints.add(_hexCharPairToByte(text, i));
         i += 2;
         if (i == text.length)
           break;
         ch = text[i];
       }
-      result.add(decodeUtf8(codepoints));
+      result.write(decodeUtf8(codepoints));
     }
   }
   return result.toString();
 }