Fix ApiDoc to work with new dart:html code. Tweak dart:html generator to generate clearer @domName …

lib/dartdoc/dartdoc.dart

Index: lib/dartdoc/dartdoc.dart
diff --git a/lib/dartdoc/dartdoc.dart b/lib/dartdoc/dartdoc.dart
index 23b0297831ba074b7e359f01446a0ddb54735656..57191283f9718f3c214726e17a676fc2e7f09cf6 100644
--- a/lib/dartdoc/dartdoc.dart
+++ b/lib/dartdoc/dartdoc.dart
@@ -981,23 +981,25 @@ class Dartdoc {
   String getTypeComment(Type type) {
     String comment = _comments.find(type.span);
     if (comment == null) return null;
-    return md.markdownToHtml(comment);
+    return commentToHtml(comment);
   }
 
   /** Get the doc comment associated with the given method. */
   String getMethodComment(MethodMember method) {
     String comment = _comments.find(method.span);
     if (comment == null) return null;
-    return md.markdownToHtml(comment);
+    return commentToHtml(comment);
   }
 
   /** Get the doc comment associated with the given field. */
   String getFieldComment(FieldMember field) {
     String comment = _comments.find(field.span);
     if (comment == null) return null;
-    return md.markdownToHtml(comment);
+    return commentToHtml(comment);
   }
 
+  String commentToHtml(String comment) => md.markdownToHtml(comment);
+
   /**
    * Converts [fullPath] which is understood to be a full path from the root of
    * the generated docs to one relative to the current file.