Fix a bug that speaker unmute when testing crosstalk

BUG=None
TEST=None

Change-Id: I869a0608f0f503d85db0d6f5280c03c66e8bbdd3
Reviewed-on: https://gerrit.chromium.org/gerrit/33484
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Tested-by: Hsinyu Chao <hychao@chromium.org>
diff --git a/client/site_tests/factory_AudioQuality/factory_AudioQuality.py b/client/site_tests/factory_AudioQuality/factory_AudioQuality.py
index e94c127..c6688e7 100644
--- a/client/site_tests/factory_AudioQuality/factory_AudioQuality.py
+++ b/client/site_tests/factory_AudioQuality/factory_AudioQuality.py
@@ -231,14 +231,12 @@
         self.restore_configuration()
         self.ui.CallJSFunction('setMessage', _LABEL_PLAYTONE_LEFT)
         self.playback_switch(False, True)
-        self.unmute_speaker()
         self.play_tone()
 
     def handle_xtalk_right(self, *args):
         self.restore_configuration()
         self.ui.CallJSFunction('setMessage', _LABEL_PLAYTONE_RIGHT)
         self.playback_switch(True, False)
-        self.unmute_speaker()
         self.play_tone()
 
     def listen_forever(self, sock):