[orca] Chromium: Work around document claiming index in parent of -1

[Joanmarie Diggs <joanied src gnome org>]

commit 92cd26de8988417a3af3a84dbdce60d9a34057d4
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Nov 12 14:18:31 2018 -0500

    Chromium: Work around document claiming index in parent of -1

 src/orca/scripts/toolkits/Chromium/script_utilities.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/orca/scripts/toolkits/Chromium/script_utilities.py 
b/src/orca/scripts/toolkits/Chromium/script_utilities.py
index cdd447270..41bcf4fb9 100644
--- a/src/orca/scripts/toolkits/Chromium/script_utilities.py
+++ b/src/orca/scripts/toolkits/Chromium/script_utilities.py
@@ -90,8 +90,9 @@ class Utilities(web.Utilities):
         if not super().isZombie(obj):
             return False
 
-        # Things (so far) seem to work as expected for document content.
-        if self.inDocumentContent(obj):
+        # Things (so far) seem to work as expected for document content -- except the
+        # document frame itself.
+        if not self.isDocument(obj) and self.inDocumentContent(obj):
             return True
 
         # HACK for other items, including (though possibly not limited to) menu items