Always include base extension type in Mac select file dialog

ui/base/dialogs/select_file_dialog_mac.mm

Index: ui/base/dialogs/select_file_dialog_mac.mm
diff --git a/ui/base/dialogs/select_file_dialog_mac.mm b/ui/base/dialogs/select_file_dialog_mac.mm
index e844c937811b8c9203baced25f59a8dfee83a088..0fe1df0287fa5553b45a4c9575f715da6266fa7b 100644
--- a/ui/base/dialogs/select_file_dialog_mac.mm
+++ b/ui/base/dialogs/select_file_dialog_mac.mm
@@ -227,6 +227,11 @@ void SelectFileDialogImpl::SelectFileImpl(
           base::mac::ScopedCFTypeRef<CFStringRef> uti(
               CreateUTIFromExtension(ext_list[j]));
           [file_type_set addObject:base::mac::CFToNSCast(uti.get())];
+
+          // Always allow the extension itself, in case the UTI does not exist.
+          base::mac::ScopedCFTypeRef<CFStringRef> ext_cf(
+              base::SysUTF8ToCFStringRef(ext_list[j]));
+          [file_type_set addObject:base::mac::CFToNSCast(ext_cf.get())];

[Avi (use Gerrit), 2012/09/13 05:52:39]

UTIs always exist. Dynamic UTIs exist to round-trip for exactly this purpose.
This sounds like a bug, either on our end or Apple's. Can you pull this out into
a small test app so we can file a bug with Apple?

[thorogood, 2012/09/16 23:50:49]

Done, I've attached it to the bug (which I've CC'ed you on).

[Avi (use Gerrit), 2012/09/17 02:41:45]

What The F. Can you link the bug in the comment?

[thorogood, 2012/09/17 03:19:06]

Done, linked to the issue 148840.

         }
       }
       allowed_file_types = [file_type_set allObjects];