Use the factory instead of using the builtin code path in VideoCodecInitializer.

Bug: webrtc:9513
Change-Id: Ia299ae1044a3ff4c91e208200938cba540bdcea6
Reviewed-on: https://webrtc-review.googlesource.com/c/94782
Commit-Queue: Jiawei Ou <ouj@fb.com>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25456}

modules/video_coding/codecs/test/videoprocessor.cc

@@ -14,6 +14,7 @@
 #include <limits>
 #include <utility>
 
+#include "api/video/builtin_video_bitrate_allocator_factory.h"
 #include "api/video/i420_buffer.h"
 #include "common_types.h"  // NOLINT(build/include)
 #include "common_video/h264/h264_common.h"
@@ -173,8 +174,9 @@ VideoProcessor::VideoProcessor(webrtc::VideoEncoder* encoder,
       stats_(stats),
       encoder_(encoder),
       decoders_(decoders),
-      bitrate_allocator_(VideoCodecInitializer::CreateBitrateAllocator(
-          config_.codec_settings)),
+      bitrate_allocator_(
+          CreateBuiltinVideoBitrateAllocatorFactory()
+              ->CreateVideoBitrateAllocator(config_.codec_settings)),
       framerate_fps_(0),
       encode_callback_(this),
       input_frame_reader_(input_frame_reader),