Mandoline: let html_viewer handle more contents

mojo/shell/fetcher.h

Index: mojo/shell/fetcher.h
diff --git a/mojo/shell/fetcher.h b/mojo/shell/fetcher.h
index 7b135d9270f361f8312f5111a98befec9fca7087..c5e28a25cc844ae0ad82cf9a3a19301660ad6779 100644
--- a/mojo/shell/fetcher.h
+++ b/mojo/shell/fetcher.h
@@ -34,7 +34,6 @@ class Fetcher {
   // The param will be null in the case where the content could not be fetched.
   // Reasons include:
   // - network error
-  // - 4x or 5x HTTP errors
   typedef base::Callback<void(scoped_ptr<Fetcher>)> FetchCallback;
 
   Fetcher(const FetchCallback& fetch_callback);