pkg/docgen: update markdown to 0.5.1

third_party/pkg/markdown/lib/src/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.
 
-part of markdown;
+library markdown.inline_parser;
+
+import 'ast.dart';
+import 'document.dart';
+import 'util.dart';
 
 /// Maintains the internal state needed to parse inline span elements in
 /// markdown.
 class InlineParser {
   static List<InlineSyntax>  defaultSyntaxes = <InlineSyntax>[
     // This first regexp matches plain text to accelerate parsing.  It must
     // be written so that it does not match any prefix of any following
     // syntax.  Most markdown is plain text, so it is faster to match one
     // regexp per 'word' rather than fail to match all the following regexps
     // at each non-syntax character position.  It is much more important
@@ skipping 394 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;
   }
 }