[orca] Use the Gecko script's useCaretNavigationModel() in Thunderbird

[Joanmarie Diggs <joanied src gnome org>]

commit b88947257b18b2311c42044089575a25486ff265
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Sun Apr 20 14:05:51 2014 -0400

    Use the Gecko script's useCaretNavigationModel() in Thunderbird

 src/orca/scripts/apps/Thunderbird/script.py |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)
---
diff --git a/src/orca/scripts/apps/Thunderbird/script.py b/src/orca/scripts/apps/Thunderbird/script.py
index c98ce9c..72c7da6 100644
--- a/src/orca/scripts/apps/Thunderbird/script.py
+++ b/src/orca/scripts/apps/Thunderbird/script.py
@@ -416,15 +416,6 @@ class Script(Gecko.Script):
 
         return True
 
-    def useCaretNavigationModel(self, keyboardEvent):
-        """Returns True if we should do our own caret navigation."""
-
-        if self.isEditableMessage(orca_state.locusOfFocus) \
-           or self.isNonHTMLEntry(orca_state.locusOfFocus):
-            return False
-
-        return Gecko.Script.useCaretNavigationModel(self, keyboardEvent)
-
     def onWindowActivated(self, event):
         """Callback for window:activate accessibility events."""