Revert "Implement H264 simulcast support and generalize SimulcastEncoderAdapter use for H264 & VP8."

This reverts commit 07efe436c9002e139845f62486e3ee4e29f0d85b.

Reason for revert: Breaks downstream project.

cricket::GetSimulcastConfig method signature has been updated.
I think you can get away with a default value for temporal_layers_supported (and then you can remove it after a few days when projects will be updated).


Original change's description:
> Implement H264 simulcast support and generalize SimulcastEncoderAdapter use for H264 & VP8.
> 
> * Move SimulcastEncoderAdapter out under modules/video_coding
> * Move SimulcastRateAllocator back out to modules/video_coding/utility
> * Move TemporalLayers and ScreenshareLayers to modules/video_coding/utility
> * Move any VP8 specific code - such as temporal layer bitrate budgeting -
>   under codec type dependent conditionals.
> * Plumb the simulcast index for H264 in the codec specific and RTP format data structures.
> 
> Bug: webrtc:5840
> Change-Id: Ieced8a00e38f273c1a6cfd0f5431a87d07b8f44e
> Reviewed-on: https://webrtc-review.googlesource.com/64100
> Commit-Queue: Harald Alvestrand <hta@webrtc.org>
> Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> Reviewed-by: Erik Språng <sprang@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#23705}

TBR=sprang@webrtc.org,stefan@webrtc.org,mflodman@webrtc.org,hta@webrtc.org,sergio.garcia.murillo@gmail.com,titovartem@webrtc.org,agouaillard@gmail.com

Change-Id: Ic9d3b1eeaf195bb5ec2063954421f5e77866d663
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:5840
Reviewed-on: https://webrtc-review.googlesource.com/84760
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23710}
diff --git a/api/test/create_simulcast_test_fixture.cc b/api/test/create_simulcast_test_fixture.cc
index 14bd5ab..49cd0f4 100644
--- a/api/test/create_simulcast_test_fixture.cc
+++ b/api/test/create_simulcast_test_fixture.cc
@@ -14,7 +14,7 @@
 #include <utility>
 
 #include "api/test/simulcast_test_fixture.h"
-#include "modules/video_coding/utility/simulcast_test_fixture_impl.h"
+#include "modules/video_coding/codecs/vp8/simulcast_test_fixture_impl.h"
 #include "rtc_base/ptr_util.h"
 
 namespace webrtc {
@@ -22,11 +22,9 @@
 
 std::unique_ptr<SimulcastTestFixture> CreateSimulcastTestFixture(
     std::unique_ptr<VideoEncoderFactory> encoder_factory,
-    std::unique_ptr<VideoDecoderFactory> decoder_factory,
-    SdpVideoFormat video_format) {
+    std::unique_ptr<VideoDecoderFactory> decoder_factory) {
   return rtc::MakeUnique<SimulcastTestFixtureImpl>(std::move(encoder_factory),
-                                                   std::move(decoder_factory),
-                                                   video_format);
+                                                   std::move(decoder_factory));
 }
 
 }  // namespace test
diff --git a/api/test/create_simulcast_test_fixture.h b/api/test/create_simulcast_test_fixture.h
index 87f229c..787e72d 100644
--- a/api/test/create_simulcast_test_fixture.h
+++ b/api/test/create_simulcast_test_fixture.h
@@ -14,7 +14,6 @@
 #include <memory>
 
 #include "api/test/simulcast_test_fixture.h"
-#include "api/video_codecs/sdp_video_format.h"
 #include "api/video_codecs/video_decoder_factory.h"
 #include "api/video_codecs/video_encoder_factory.h"
 
@@ -23,8 +22,7 @@
 
 std::unique_ptr<SimulcastTestFixture> CreateSimulcastTestFixture(
     std::unique_ptr<VideoEncoderFactory> encoder_factory,
-    std::unique_ptr<VideoDecoderFactory> decoder_factory,
-    SdpVideoFormat video_format);
+    std::unique_ptr<VideoDecoderFactory> decoder_factory);
 
 }  // namespace test
 }  // namespace webrtc
diff --git a/api/video_codecs/test/BUILD.gn b/api/video_codecs/test/BUILD.gn
index 1894309..8dc2fcc 100644
--- a/api/video_codecs/test/BUILD.gn
+++ b/api/video_codecs/test/BUILD.gn
@@ -22,8 +22,8 @@
       "..:rtc_software_fallback_wrappers",
       "..:video_codecs_api",
       "../../../modules/video_coding:video_codec_interface",
-      "../../../modules/video_coding:video_coding_utility",
       "../../../modules/video_coding:webrtc_vp8",
+      "../../../modules/video_coding:webrtc_vp8_helpers",
       "../../../rtc_base:checks",
       "../../../rtc_base:rtc_base_tests_utils",
       "../../../system_wrappers:metrics_default",
diff --git a/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc b/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc
index a1a43b4..ad40f90 100644
--- a/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc
+++ b/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc
@@ -15,10 +15,10 @@
 #include "api/video/i420_buffer.h"
 #include "api/video/video_bitrate_allocation.h"
 #include "modules/video_coding/codecs/vp8/include/vp8.h"
+#include "modules/video_coding/codecs/vp8/simulcast_rate_allocator.h"
 #include "modules/video_coding/codecs/vp8/temporal_layers.h"
 #include "modules/video_coding/include/video_codec_interface.h"
 #include "modules/video_coding/include/video_error_codes.h"
-#include "modules/video_coding/utility/simulcast_rate_allocator.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/fakeclock.h"
 #include "test/field_trial.h"