Change SetOutputScaling to set a single level, not left/right levels.

talk/app/webrtc/webrtcsession_unittest.cc

Index: talk/app/webrtc/webrtcsession_unittest.cc
diff --git a/talk/app/webrtc/webrtcsession_unittest.cc b/talk/app/webrtc/webrtcsession_unittest.cc
index 2853ca43a7301b5e28b202f60041f35784342bb2..8f879b2a390d5c6fadab5c6fde245ac83c93b97e 100644
--- a/talk/app/webrtc/webrtcsession_unittest.cc
+++ b/talk/app/webrtc/webrtcsession_unittest.cc
@@ -3108,20 +3108,17 @@ TEST_F(WebRtcSessionTest, SetAudioPlayout) {
   ASSERT_TRUE(channel != NULL);
   ASSERT_EQ(1u, channel->recv_streams().size());
   uint32_t receive_ssrc = channel->recv_streams()[0].first_ssrc();
-  double left_vol, right_vol;
-  EXPECT_TRUE(channel->GetOutputScaling(receive_ssrc, &left_vol, &right_vol));
-  EXPECT_EQ(1, left_vol);
-  EXPECT_EQ(1, right_vol);
+  double volume;
+  EXPECT_TRUE(channel->GetOutputScaling(receive_ssrc, &volume));
+  EXPECT_EQ(1, volume);
   rtc::scoped_ptr<FakeAudioRenderer> renderer(new FakeAudioRenderer());
   session_->SetAudioPlayout(receive_ssrc, false, renderer.get());
-  EXPECT_TRUE(channel->GetOutputScaling(receive_ssrc, &left_vol, &right_vol));
-  EXPECT_EQ(0, left_vol);
-  EXPECT_EQ(0, right_vol);
+  EXPECT_TRUE(channel->GetOutputScaling(receive_ssrc, &volume));
+  EXPECT_EQ(0, volume);
   EXPECT_EQ(0, renderer->channel_id());
   session_->SetAudioPlayout(receive_ssrc, true, NULL);
-  EXPECT_TRUE(channel->GetOutputScaling(receive_ssrc, &left_vol, &right_vol));
-  EXPECT_EQ(1, left_vol);
-  EXPECT_EQ(1, right_vol);
+  EXPECT_TRUE(channel->GetOutputScaling(receive_ssrc, &volume));
+  EXPECT_EQ(1, volume);
   EXPECT_EQ(-1, renderer->channel_id());
 }