Vp9: Enable denoiser by default.

webrtc/media/engine/webrtcvideoengine2.cc

Index: webrtc/media/engine/webrtcvideoengine2.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2.cc b/webrtc/media/engine/webrtcvideoengine2.cc
index f5682edfe65638877736145b50eadc5925fa2c92..f4b4b6f790d1c79f7a463b560868a9022a8772f5 100644
--- a/webrtc/media/engine/webrtcvideoengine2.cc
+++ b/webrtc/media/engine/webrtcvideoengine2.cc
@@ -409,7 +409,7 @@ WebRtcVideoChannel2::WebRtcVideoSendStream::ConfigureVideoEncoderSettings(
       vp9_settings.numberOfSpatialLayers = GetDefaultVp9SpatialLayers();
     }
     // VP9 denoising is disabled by default.
-    vp9_settings.denoisingOn = codec_default_denoising ? false : denoising;
+    vp9_settings.denoisingOn = codec_default_denoising ? true : denoising;
     vp9_settings.frameDroppingOn = frame_dropping;
     return new rtc::RefCountedObject<
         webrtc::VideoEncoderConfig::Vp9EncoderSpecificSettings>(vp9_settings);