Update VP8E_SET_CPUUSED to 9 for VP9 in CRD

This is the last of 3 CLs where I drop VP8E_SET_CPUUSED to the
target value for the M103 release.

Bug: b:217468304
Change-Id: I937ccd2dcd9439936ac5d3ed09b5a3e07d40d885
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3626044
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1000400}

remoting/codec/webrtc_video_encoder_vpx.cc

@@ -143,7 +143,7 @@ void SetVp9CodecOptions(vpx_codec_ctx_t* codec, bool lossless_encode) {
   // Request the lowest-CPU usage that VP9 supports, which depends on whether
   // we are encoding lossy or lossless.
   // Note that this knob uses the same parameter name as VP8.
-  int cpu_used = lossless_encode ? 5 : 8;
+  int cpu_used = lossless_encode ? 5 : 9;
   vpx_codec_err_t ret = vpx_codec_control(codec, VP8E_SET_CPUUSED, cpu_used);
   DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set CPUUSED";