Enable VP9 internal resize by default.

webrtc/modules/video_coding/main/source/codec_database.cc

Index: webrtc/modules/video_coding/main/source/codec_database.cc
diff --git a/webrtc/modules/video_coding/main/source/codec_database.cc b/webrtc/modules/video_coding/main/source/codec_database.cc
index f870e86a520a12d7f46c8aac1a11501edcbec75f..bfdc609e3c1e69ba30052a87c132777d5a9f6d54 100644
--- a/webrtc/modules/video_coding/main/source/codec_database.cc
+++ b/webrtc/modules/video_coding/main/source/codec_database.cc
@@ -61,7 +61,7 @@ VideoCodecVP9 VideoEncoder::GetDefaultVp9Settings() {
   vp9_settings.frameDroppingOn = true;
   vp9_settings.keyFrameInterval = 3000;
   vp9_settings.adaptiveQpMode = true;
-  vp9_settings.automaticResizeOn = false;
+  vp9_settings.automaticResizeOn = true;
   vp9_settings.numberOfSpatialLayers = 1;
   vp9_settings.flexibleMode = false;
   return vp9_settings;