Change IllegalArgumentException to ArgumentError.

lib/uri/encode_decode.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.
 
 /**
  * Javascript-like URI encode/decode functions.
  * The documentation here borrows heavily from the original Javascript
  * doumentation on MDN at:
  * https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects
  */
@@ skipping 72 matching lines @@
     } else {
       int ch = text.charCodeAt(i);
       if (ch >= 0xD800 && ch < 0xDC00) {
         // Low surrogate. We expect a next char high surrogate.
         ++i;
         int nextCh = text.length == i ? 0 : text.charCodeAt(i);
         if (nextCh >= 0xDC00 && nextCh < 0xE000) {
           // convert the pair to a U+10000 codepoint
           ch = 0x10000 + ((ch-0xD800) << 10) + (nextCh - 0xDC00);
         } else {
-          throw new IllegalArgumentException('Malformed URI');
+          throw new ArgumentError('Malformed URI');
         }
       }
       for (int codepoint in codepointsToUtf8([ch])) {
         result.add(byteToHex(codepoint));
       }
     }
   }
   return result.toString();
 }
 
@@ skipping 21 matching lines @@
   List<int> codepoints = new List<int>();
   for (int i = 0; i < text.length;) {
     String ch = text[i];
     if (ch != '%') {
       result.add(ch);
       i++;
     } else {
       codepoints.clear();
       while (ch == '%') {
         if (++i > text.length - 2) {
-          throw new IllegalArgumentException('Truncated URI');
+          throw new ArgumentError('Truncated URI');
         }
         codepoints.add(_hexCharPairToByte(text, i));
         i += 2;
         if (i == text.length)
           break;
         ch = text[i];
       }
       result.add(decodeUtf8(codepoints));
     }
   }
   return result.toString();
 }