[orca] Chromium: Update support for changes in Chromium list item markers

[Joanmarie Diggs <joanied src gnome org>]

commit 8103afc80d7a4ec4528fd2cbb6cf1af298f1615e
Author: Joanmarie Diggs <joanmarie diggs gmail com>
Date:   Thu Jan 30 19:06:38 2020 -0500

    Chromium: Update support for changes in Chromium list item markers
    
    We have a reliable tag now, and the text is no longer an embedded
    object character.

 src/orca/scripts/toolkits/Chromium/script_utilities.py | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
---
diff --git a/src/orca/scripts/toolkits/Chromium/script_utilities.py 
b/src/orca/scripts/toolkits/Chromium/script_utilities.py
index 535880c75..f2706c6a5 100644
--- a/src/orca/scripts/toolkits/Chromium/script_utilities.py
+++ b/src/orca/scripts/toolkits/Chromium/script_utilities.py
@@ -99,11 +99,7 @@ class Utilities(web.Utilities):
         if rv is not None:
             return rv
 
-        rv = not self._getTag(obj) \
-            and obj.parent.getRole() == pyatspi.ROLE_LIST_ITEM \
-            and obj.getIndexInParent() == 0 \
-            and obj.parent.queryText().getText(0, 1) == self.EMBEDDED_OBJECT_CHARACTER
-
+        rv = self._getTag(obj) == "::marker" and obj.parent.getRole() == pyatspi.ROLE_LIST_ITEM
         self._isListItemMarker[hash(obj)] = rv
         return rv