Get dartdoc in the SDK and working correctly.

utils/apidoc/html_diff.dart

Index: utils/apidoc/html_diff.dart
diff --git a/utils/apidoc/html_diff.dart b/utils/apidoc/html_diff.dart
index d6764e18590447680986209c09635e64d16d1120..46b57920d60b1ee7eb156ae651bb86899c7442d1 100644
--- a/utils/apidoc/html_diff.dart
+++ b/utils/apidoc/html_diff.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -12,7 +12,7 @@
 #import('../../frog/lang.dart');
 #import('../../frog/file_system_vm.dart');
 #import('../../frog/file_system.dart');
-#import('../dartdoc/dartdoc.dart');
+#import('../../lib/dartdoc/dartdoc.dart');
 
 /**
  * A class for computing a many-to-many mapping between the types and members in