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/modules/video_coding/video_coding_impl.cc b/modules/video_coding/video_coding_impl.cc
index aa9a0d5..1127b0f 100644
--- a/modules/video_coding/video_coding_impl.cc
+++ b/modules/video_coding/video_coding_impl.cc
@@ -16,6 +16,7 @@
 #include "common_types.h"  // NOLINT(build/include)
 #include "common_video/include/video_bitrate_allocator.h"
 #include "common_video/libyuv/include/webrtc_libyuv.h"
+#include "modules/video_coding/codecs/vp8/temporal_layers.h"
 #include "modules/video_coding/encoded_frame.h"
 #include "modules/video_coding/include/video_codec_initializer.h"
 #include "modules/video_coding/include/video_codec_interface.h"
@@ -104,16 +105,17 @@
   int32_t RegisterSendCodec(const VideoCodec* sendCodec,
                             uint32_t numberOfCores,
                             uint32_t maxPayloadSize) override {
-    if (sendCodec != nullptr && ((sendCodec->codecType == kVideoCodecVP8) ||
-                                 (sendCodec->codecType == kVideoCodecH264))) {
-      // Set up a rate allocator and temporal layers factory for this codec
+    if (sendCodec != nullptr && sendCodec->codecType == kVideoCodecVP8) {
+      // Set up a rate allocator and temporal layers factory for this vp8
       // instance. The codec impl will have a raw pointer to the TL factory,
       // and will call it when initializing. Since this can happen
       // asynchronously keep the instance alive until destruction or until a
       // new send codec is registered.
-      VideoCodec codec = *sendCodec;
-      rate_allocator_ = VideoCodecInitializer::CreateBitrateAllocator(codec);
-      return sender_.RegisterSendCodec(&codec, numberOfCores, maxPayloadSize);
+      VideoCodec vp8_codec = *sendCodec;
+      rate_allocator_ =
+          VideoCodecInitializer::CreateBitrateAllocator(vp8_codec);
+      return sender_.RegisterSendCodec(&vp8_codec, numberOfCores,
+                                       maxPayloadSize);
     }
     return sender_.RegisterSendCodec(sendCodec, numberOfCores, maxPayloadSize);
   }