Fix/Add content_unittests to work for the code behind --enable-audio-track-processing

content/renderer/media/media_stream_audio_processor.cc

Index: content/renderer/media/media_stream_audio_processor.cc
diff --git a/content/renderer/media/media_stream_audio_processor.cc b/content/renderer/media/media_stream_audio_processor.cc
index ef693b241cee6b352a6c28efe5ba97d58cacd7a6..cdaa7f127d2e6a1bafc8a225fd8ef39310633071 100644
--- a/content/renderer/media/media_stream_audio_processor.cc
+++ b/content/renderer/media/media_stream_audio_processor.cc
@@ -264,10 +264,8 @@ void MediaStreamAudioProcessor::InitializeAudioProcessingModule(
     const blink::WebMediaConstraints& constraints, int effects,
     MediaStreamType type) {
   DCHECK(!audio_processing_);
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableAudioTrackProcessing)) {
+  if (!IsAudioTrackProcessingEnabled())
     return;
-  }
 
   RTCMediaConstraints native_constraints(constraints);
 
@@ -488,4 +486,9 @@ void MediaStreamAudioProcessor::StopAudioProcessing() {
   audio_processing_.reset();
 }
 
+bool MediaStreamAudioProcessor::IsAudioTrackProcessingEnabled() const {
+  return CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableAudioTrackProcessing);
+}
+
 }  // namespace content