pkg/docgen: update markdown to 0.5.1

third_party/pkg/markdown/lib/src/inline_parser.dart

Index: third_party/pkg/markdown/lib/src/inline_parser.dart
diff --git a/third_party/pkg/markdown/lib/src/markdown/inline_parser.dart b/third_party/pkg/markdown/lib/src/inline_parser.dart
similarity index 99%
rename from third_party/pkg/markdown/lib/src/markdown/inline_parser.dart
rename to third_party/pkg/markdown/lib/src/inline_parser.dart
index d1416590ec97e1e02a3891746b38ab38fac2275e..392ca69b1904df56e9e9dfa0b18806a6b5424679 100644
--- a/third_party/pkg/markdown/lib/src/markdown/inline_parser.dart
+++ b/third_party/pkg/markdown/lib/src/inline_parser.dart
@@ -2,7 +2,11 @@
 // 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.