Move usage of QualityScaler to ViEEncoder.

webrtc/modules/video_coding/generic_encoder.cc

Index: webrtc/modules/video_coding/generic_encoder.cc
diff --git a/webrtc/modules/video_coding/generic_encoder.cc b/webrtc/modules/video_coding/generic_encoder.cc
index 80e48d19117594dc5b3447ebc6c096d5797faa5d..75bdc7c4f39c534b62270b537d23e6bb43559d8a 100644
--- a/webrtc/modules/video_coding/generic_encoder.cc
+++ b/webrtc/modules/video_coding/generic_encoder.cc
@@ -131,11 +131,6 @@ bool VCMGenericEncoder::InternalSource() const {
   return internal_source_;
 }
 
-void VCMGenericEncoder::OnDroppedFrame() {
-  RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
-  encoder_->OnDroppedFrame();
-}
-
 bool VCMGenericEncoder::SupportsNativeHandle() const {
   RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
   return encoder_->SupportsNativeHandle();