Use cpuused=6 for lossy VP9 mode

remoting/codec/video_encoder_vpx.cc

Index: remoting/codec/video_encoder_vpx.cc
diff --git a/remoting/codec/video_encoder_vpx.cc b/remoting/codec/video_encoder_vpx.cc
index 453680237e47e12baad4d3dd10aa400d80a9c656..3ee9e6ac57e4276c667187f21e675502f8e411cf 100644
--- a/remoting/codec/video_encoder_vpx.cc
+++ b/remoting/codec/video_encoder_vpx.cc
@@ -136,7 +136,7 @@ ScopedVpxCodec CreateVP9Codec(const webrtc::DesktopSize& size,
   // Request the lowest-CPU usage that VP9 supports, which depends on whether
   // we are encoding lossy or lossless.
   // Note that this is configured via the same parameter as for VP8.
-  int cpu_used = lossless_encode ? 5 : 7;
+  int cpu_used = lossless_encode ? 5 : 6;
   if (vpx_codec_control(codec.get(), VP8E_SET_CPUUSED, cpu_used))
     return ScopedVpxCodec();