bluetooth: remove deprecated au_pairing

The au_pairing method in bluetooth_AdapterAUSanity was deprecated.

BUG=b:147254544
TEST=None

Change-Id: I7299eddd6fcfc113293d3bdde358d5d088945c17
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2275568
Reviewed-by: Michael Sun <michaelfsun@google.com>
Commit-Queue: Shyh-In Hwang <josephsih@chromium.org>
Tested-by: Shyh-In Hwang <josephsih@chromium.org>
diff --git a/server/site_tests/bluetooth_AdapterAUSanity/bluetooth_AdapterAUSanity.py b/server/site_tests/bluetooth_AdapterAUSanity/bluetooth_AdapterAUSanity.py
index 7903ebf..77cfbaa 100644
--- a/server/site_tests/bluetooth_AdapterAUSanity/bluetooth_AdapterAUSanity.py
+++ b/server/site_tests/bluetooth_AdapterAUSanity/bluetooth_AdapterAUSanity.py
@@ -21,25 +21,6 @@
     batch_wrapper = BluetoothAdapterQuickTests.quick_test_batch_decorator
 
 
-    def au_pairing(self, device, test_profile):
-        """audio pairing procedure.
-
-        @param device: the bt peer device
-        @param test_profile: which test profile is used,
-                             A2DP, HFP_WBS or HFP_NBS
-        """
-        self.test_reset_on_adapter()
-        self.test_bluetoothd_running()
-        self.initialize_bluetooth_audio(device, test_profile)
-        self.test_device_set_discoverable(device, True)
-        self.test_discover_device(device.address)
-        self.test_pairing(device.address, device.pin, trusted=True)
-        device.SetTrustedByRemoteAddress(self.bluetooth_facade.address)
-        self.test_connection_by_adapter(device.address)
-        self.test_disconnection_by_adapter(device.address)
-        self.cleanup_bluetooth_audio(device, test_profile)
-
-
     def au_run_method(self, device, test_method, test_profile):
         """audio procedure of running a specified test method.