From d322e351554a4fa1fbaf529769416041031f07e9 Mon Sep 17 00:00:00 2001
From: Jeremy Apthorp <jeremya@chromium.org>
Date: Mon, 6 Aug 2018 13:02:53 -0700
Subject: fix: [mas] don't call private api AudioDeviceDuck

---
 media/audio/mac/audio_low_latency_input_mac.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/media/audio/mac/audio_low_latency_input_mac.cc b/media/audio/mac/audio_low_latency_input_mac.cc
index 173167b54dfb..1c0fda354d03 100644
--- a/media/audio/mac/audio_low_latency_input_mac.cc
+++ b/media/audio/mac/audio_low_latency_input_mac.cc
@@ -28,12 +28,14 @@
 
 namespace {
 extern "C" {
+#ifndef MAS_BUILD
 // See:
 // https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/PAL/pal/spi/cf/CoreAudioSPI.h?rev=228264
 OSStatus AudioDeviceDuck(AudioDeviceID inDevice,
                          Float32 inDuckedLevel,
                          const AudioTimeStamp* __nullable inStartTime,
                          Float32 inRampDuration) __attribute__((weak_import));
+#endif
 }
 
 }  // namespace
@@ -604,6 +606,7 @@ bool AUAudioInputStream::OpenVoiceProcessingAU() {
     return false;
   }
 
+#ifndef MAS_BUILD
   if (AudioDeviceDuck != nullptr) {
     // Undo the ducking.
     // Obtain the AudioDeviceID of the default output AudioDevice.
@@ -619,6 +622,7 @@ bool AUAudioInputStream::OpenVoiceProcessingAU() {
       AudioDeviceDuck(output_device, 1.0, nullptr, 0.5);
     }
   }
+#endif
 
   return true;
 }
-- 
2.17.0