am 2caf31a9: Fix memory leak in FragmentManager backstack.

* commit '2caf31a93708d7c27a8dc80ace3fc7c3330b2bf0':
  Fix memory leak in FragmentManager backstack.
diff --git a/src/com/android/mail/browse/ConversationCursor.java b/src/com/android/mail/browse/ConversationCursor.java
index b648804..15457ab 100644
--- a/src/com/android/mail/browse/ConversationCursor.java
+++ b/src/com/android/mail/browse/ConversationCursor.java
@@ -1946,6 +1946,15 @@
     }
 
     @Override
+    public Uri getNotificationUri() {
+        if (mUnderlyingCursor == null) {
+            return null;
+        } else {
+            return mUnderlyingCursor.getNotificationUri();
+        }
+    }
+
+    @Override
     public void setNotificationUri(ContentResolver cr, Uri uri) {
         throw new UnsupportedOperationException();
     }