Reland "Replace VideoDecoder with VideoDecoderFactory in VideoReceiveStream config."

This is a reland of 529d0d9795b81dbed5e4231f15d3752a5fc0df32

Original change's description:
> Replace VideoDecoder with VideoDecoderFactory in VideoReceiveStream config.
> 
> Preparation for deleting EnableFrameRecordning, and also a step
> towards landing of the new VideoStreamDecoder.
> 
> Bug: webrtc:9106
> Change-Id: I50964ee458b08a702ec69b82a62e4995c57cee82
> Reviewed-on: https://webrtc-review.googlesource.com/97660
> Commit-Queue: Niels Moller <nisse@webrtc.org>
> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
> Reviewed-by: Anders Carlsson <andersc@webrtc.org>
> Reviewed-by: Sebastian Jansson <srte@webrtc.org>
> Reviewed-by: Erik Språng <sprang@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#24861}

Bug: webrtc:9106
Change-Id: I2eb894773b3f33ff6a980e8008e8248607e32668
Reviewed-on: https://webrtc-review.googlesource.com/102480
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24882}
diff --git a/video/video_stream_encoder_unittest.cc b/video/video_stream_encoder_unittest.cc
index 32665d5..e09df82 100644
--- a/video/video_stream_encoder_unittest.cc
+++ b/video/video_stream_encoder_unittest.cc
@@ -22,13 +22,13 @@
 #include "rtc_base/refcountedobject.h"
 #include "system_wrappers/include/metrics.h"
 #include "system_wrappers/include/sleep.h"
-#include "test/encoder_proxy_factory.h"
 #include "test/encoder_settings.h"
 #include "test/fake_encoder.h"
 #include "test/field_trial.h"
 #include "test/frame_generator.h"
 #include "test/gmock.h"
 #include "test/gtest.h"
+#include "test/video_encoder_proxy_factory.h"
 #include "video/send_statistics_proxy.h"
 #include "video/video_stream_encoder.h"
 
@@ -691,7 +691,7 @@
   int codec_height_;
   int max_framerate_;
   TestEncoder fake_encoder_;
-  test::EncoderProxyFactory encoder_factory_;
+  test::VideoEncoderProxyFactory encoder_factory_;
   std::unique_ptr<MockableSendStatisticsProxy> stats_proxy_;
   TestSink sink_;
   AdaptingFrameForwarder video_source_;