[a11y] Fix TalkBack readback on adb qrcode fragment.
TalkBack was picking up the text in the action bar, so if we hide it,
it will read the first body of text it encounters which would be "Scan
QR code. Pair device over Wi-Fi by scanning a QR code."
Bug: 152461605
Test: Manual. Enable TalkBack in Settings > Accessibility > TalkBack.
Navigate to Developer options > Wireless debugging > Pair by QR code.
When QR code scanner fragment opens, it should say "Scan QR code. Pair
device over Wi-Fi by scanning a QR code."
Change-Id: Ia91bf4ea215e6a377335f2b9dcf2acf10afd268e
(cherry picked from commit bfd73c0d78f9fc20b98fd42b481d61cbd702adab)
Exempt-From-Owner-Approval: cherry-pick
1 file changed