Clean up useless defender dialog code

Test: Unit test passed
Bug: 260687359
Merged-In: If3cbe4072c891f1af6b5aa4fb624e4e486c78ad6
Change-Id: If3cbe4072c891f1af6b5aa4fb624e4e486c78ad6
Signed-off-by: Zhenwei Chen <zhenwec@google.com>
(cherry picked from commit a725bac68c9d1846cef096e4c5958b161787cd9c)
3 files changed