Fix HTTP links in URI docs.

lib/dartdoc/inline_parser.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.
 
 /// Maintains the internal state needed to parse inline span elements in
 /// markdown.
 class InlineParser {
   static List<InlineSyntax> get syntaxes() {
     // Lazy initialize.
     if (_syntaxes == null) {
@@ skipping 270 matching lines @@
         url = url.substring(1, url.length - 1);
       }
     } else {
       // Reference link like [foo] [bar].
       var id = match[2];
       if (id == '') {
         // The id is empty ("[]") so infer it from the contents.
         id = parser.source.substring(state.startPos + 1, parser.pos);
       }
 
+      // References are case-insensitive.
+      id = id.toLowerCase();
+
       // Look up the link.
       final link = parser.document.refLinks[id];
       // If it's an unknown link just emit plaintext.
       if (link == null) return false;
 
       url = link.url;
       title = link.title;
     }
 
     final anchor = new Element('a', state.children);
@@ skipping 85 matching lines @@
       parser.consume(endMatch[0].length);
     } else {
       // Didn't close correctly so revert to text.
       parser.start = startPos;
       parser.advanceBy(endMatch[0].length);
     }
 
     return null;
   }
 }