Change kEnableAudioTrackProcessing to a disable flag and remove finch code

content/renderer/media/media_stream_audio_processor_unittest.cc

Index: content/renderer/media/media_stream_audio_processor_unittest.cc
diff --git a/content/renderer/media/media_stream_audio_processor_unittest.cc b/content/renderer/media/media_stream_audio_processor_unittest.cc
index 233f30d04c7dbc8d936ab6ce8be9ae84fbe6298b..d48f1c56940c964ca42a11e1993e00dadc552f30 100644
--- a/content/renderer/media/media_stream_audio_processor_unittest.cc
+++ b/content/renderer/media/media_stream_audio_processor_unittest.cc
@@ -153,7 +153,9 @@ class MediaStreamAudioProcessorTest : public ::testing::Test {
 };
 
 TEST_F(MediaStreamAudioProcessorTest, WithoutAudioProcessing) {
-  // Setup the audio processor without enabling the flag.
+  // Setup the audio processor with disabled flag on.
+  CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kDisableAudioTrackProcessing);
   MockMediaConstraintFactory constraint_factory;
   scoped_refptr<WebRtcAudioDeviceImpl> webrtc_audio_device(
       new WebRtcAudioDeviceImpl());
@@ -174,9 +176,6 @@ TEST_F(MediaStreamAudioProcessorTest, WithoutAudioProcessing) {
 }
 
 TEST_F(MediaStreamAudioProcessorTest, WithAudioProcessing) {
-  // Setup the audio processor with the flag enabled.
-  CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kEnableAudioTrackProcessing);
   MockMediaConstraintFactory constraint_factory;
   scoped_refptr<WebRtcAudioDeviceImpl> webrtc_audio_device(
       new WebRtcAudioDeviceImpl());
@@ -198,9 +197,6 @@ TEST_F(MediaStreamAudioProcessorTest, WithAudioProcessing) {
 }
 
 TEST_F(MediaStreamAudioProcessorTest, VerifyTabCaptureWithoutAudioProcessing) {
-  // Setup the audio processor with enabling the flag.
-  CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kEnableAudioTrackProcessing);
   scoped_refptr<WebRtcAudioDeviceImpl> webrtc_audio_device(
       new WebRtcAudioDeviceImpl());
   // Create MediaStreamAudioProcessor instance for kMediaStreamSourceTab source.
@@ -237,10 +233,6 @@ TEST_F(MediaStreamAudioProcessorTest, VerifyTabCaptureWithoutAudioProcessing) {
 }
 
 TEST_F(MediaStreamAudioProcessorTest, TurnOffDefaultConstraints) {
-  // Setup the audio processor with enabling the flag.
-  CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kEnableAudioTrackProcessing);
-
   // Turn off the default constraints and pass it to MediaStreamAudioProcessor.
   MockMediaConstraintFactory constraint_factory;
   constraint_factory.DisableDefaultAudioConstraints();
@@ -263,10 +255,6 @@ TEST_F(MediaStreamAudioProcessorTest, TurnOffDefaultConstraints) {
 }
 
 TEST_F(MediaStreamAudioProcessorTest, VerifyConstraints) {
-  // Setup the audio processor with enabling the flag.
-  CommandLine::ForCurrentProcess()->AppendSwitch(
-      switches::kEnableAudioTrackProcessing);
-
   static const char* kDefaultAudioConstraints[] = {
     MediaAudioConstraints::kEchoCancellation,
     MediaAudioConstraints::kGoogAudioMirroring,