Move usage of QualityScaler to ViEEncoder.

webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h

Index: webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h
diff --git a/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h b/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h
index cb7ca34e61ef255e3e0e75fbe7da5b0416b4fb4d..6b0176f10980bc9aeb5e5ca7c68f63c6d6f69870 100644
--- a/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h
+++ b/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h
@@ -17,7 +17,6 @@
 #include "webrtc/common_video/rotation.h"
 #include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
 #include "webrtc/modules/video_coding/utility/h264_bitstream_parser.h"
-#include "webrtc/modules/video_coding/utility/quality_scaler.h"
 
 #if defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
 
@@ -47,7 +46,6 @@ class H264VideoToolboxEncoder : public H264Encoder {
 
   int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;
 
-  void OnDroppedFrame() override;
   int SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
 
   int SetRates(uint32_t new_bitrate_kbit, uint32_t frame_rate) override;
@@ -68,6 +66,8 @@ class H264VideoToolboxEncoder : public H264Encoder {
                       uint32_t timestamp,
                       VideoRotation rotation);
 
+  rtc::Optional<VideoEncoder::QPThresholds> GetQPThresholds() override;
+
  private:
   int ResetCompressionSession();
   void ConfigureCompressionSession();
@@ -85,10 +85,7 @@ class H264VideoToolboxEncoder : public H264Encoder {
   int32_t width_;
   int32_t height_;
 
-  rtc::CriticalSection quality_scaler_crit_;
-  QualityScaler quality_scaler_ GUARDED_BY(quality_scaler_crit_);
   H264BitstreamParser h264_bitstream_parser_;
-  bool enable_scaling_;
 };  // H264VideoToolboxEncoder
 
 }  // namespace webrtc