[orca] Examine the tag rather than the role when identifying nested MathML tables

[Joanmarie Diggs <joanied src gnome org>]

commit 706db8cd092f8ea3ca8b415258d5dfcce344c030
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Thu Jul 16 12:45:18 2015 +0200

    Examine the tag rather than the role when identifying nested MathML tables

 src/orca/scripts/web/script_utilities.py |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/orca/scripts/web/script_utilities.py b/src/orca/scripts/web/script_utilities.py
index d82ae0d..d0f8776 100644
--- a/src/orca/scripts/web/script_utilities.py
+++ b/src/orca/scripts/web/script_utilities.py
@@ -1529,8 +1529,7 @@ class Utilities(script_utilities.Utilities):
             return rv
 
         if not test:
-            role = obj.getRole()
-            test = lambda x: x and x.getRole() == role
+            test = lambda x: self._getTag(x) == self._getTag(obj)
 
         rv = -1
         ancestor = obj