share all the needed linux code with OpenBSD in chrome and content

content/renderer/media/webrtc_audio_device_impl.cc

Index: content/renderer/media/webrtc_audio_device_impl.cc
diff --git a/content/renderer/media/webrtc_audio_device_impl.cc b/content/renderer/media/webrtc_audio_device_impl.cc
index cb5728ece3f52a86123a582438349aef7ad6902e..240ea8974dc811378b494939b588ac78fb4823b8 100644
--- a/content/renderer/media/webrtc_audio_device_impl.cc
+++ b/content/renderer/media/webrtc_audio_device_impl.cc
@@ -366,7 +366,7 @@ int32_t WebRtcAudioDeviceImpl::Init() {
     input_buffer_size = 440;
     output_buffer_size = 440;
   }
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_OPENBSD)
   if (output_sample_rate != 48000) {
     DLOG(ERROR) << "Only 48kHz sample rate is supported on Linux.";
     return -1;