Enable platform echo cancellation through the AudioRecord path.

media/base/channel_mixer_unittest.cc

Index: media/base/channel_mixer_unittest.cc
diff --git a/media/base/channel_mixer_unittest.cc b/media/base/channel_mixer_unittest.cc
index eddbc1b90baffbe2ecb153e35a0b0132cd2eebf7..d261ad08f82c20be0edd22aa16e62c2399388852 100644
--- a/media/base/channel_mixer_unittest.cc
+++ b/media/base/channel_mixer_unittest.cc
@@ -100,20 +100,20 @@ TEST_P(ChannelMixerTest, Mixing) {
   scoped_ptr<AudioBus> input_bus = AudioBus::Create(input_channels, kFrames);
   AudioParameters input_audio(AudioParameters::AUDIO_PCM_LINEAR,
                               input_layout,
+                              input_channels,
                               AudioParameters::kAudioCDSampleRate, 16,
-                              kFrames);
-  if (input_layout == CHANNEL_LAYOUT_DISCRETE)
-    input_audio.SetDiscreteChannels(input_channels);
+                              kFrames,
+                              AudioParameters::NO_EFFECTS);
 
   ChannelLayout output_layout = GetParam().output_layout;
   int output_channels = GetParam().output_channels;
   scoped_ptr<AudioBus> output_bus = AudioBus::Create(output_channels, kFrames);
   AudioParameters output_audio(AudioParameters::AUDIO_PCM_LINEAR,
                                output_layout,
+                               output_channels,
                                AudioParameters::kAudioCDSampleRate, 16,
-                               kFrames);
-  if (output_layout == CHANNEL_LAYOUT_DISCRETE)
-    output_audio.SetDiscreteChannels(output_channels);
+                               kFrames,
+                               AudioParameters::NO_EFFECTS);
 
   const float* channel_values = GetParam().channel_values;
   ASSERT_EQ(input_bus->channels(), GetParam().num_channel_values);