Remove this code which is disabled (media/base/media_switches.cc) and depends on a private header

--- src/media/base/libaom_thread_wrapper.cc.old	2024-04-02 09:53:17.097624400 +0000
+++ src/media/base/libaom_thread_wrapper.cc	2024-04-08 17:15:53.578155000 +0000
@@ -5,17 +5,8 @@
 #include "base/logging.h"
 #include "media/base/codec_worker_impl.h"
 #include "media/base/libvpx_thread_wrapper.h"
-#include "third_party/libaom/source/libaom/aom_util/aom_thread.h"
 
 namespace media {
 
-void InitLibAomThreadWrapper() {
-  const AVxWorkerInterface interface =
-      CodecWorkerImpl<AVxWorkerInterface, AVxWorkerImpl, AVxWorker,
-                      AVxWorkerStatus, AVX_WORKER_STATUS_NOT_OK,
-                      AVX_WORKER_STATUS_OK,
-                      AVX_WORKER_STATUS_WORKING>::GetCodecWorkerInterface();
-  CHECK(aom_set_worker_interface(&interface));
-}
 
 }  // namespace media
--- src/media/base/libvpx_thread_wrapper.cc.old	2024-04-02 09:53:17.097624400 +0000
+++ src/media/base/libvpx_thread_wrapper.cc	2024-04-08 17:15:46.565471400 +0000
@@ -5,18 +5,8 @@
 #include "media/base/libvpx_thread_wrapper.h"
 
 #include "media/base/codec_worker_impl.h"
-#include "third_party/libvpx/source/libvpx/vpx_util/vpx_thread.h"
 
 namespace media {
 
-void InitLibVpxThreadWrapper() {
-  const VPxWorkerInterface interface =
-      CodecWorkerImpl<VPxWorkerInterface, VPxWorkerImpl, VPxWorker,
-                      VPxWorkerStatus, VPX_WORKER_STATUS_NOT_OK,
-                      VPX_WORKER_STATUS_OK,
-                      VPX_WORKER_STATUS_WORKING>::GetCodecWorkerInterface();
-
-  CHECK(vpx_set_worker_interface(&interface));
-}
 
 }  // namespace media
--- src/media/base/media.cc.old	2024-04-02 09:53:17.097624400 +0000
+++ src/media/base/media.cc	2024-04-08 17:16:15.369345800 +0000
@@ -53,14 +53,8 @@ class MediaInitializer {
 #endif  // BUILDFLAG(ENABLE_FFMPEG)
 
 #if BUILDFLAG(ENABLE_LIBVPX)
-    if (base::FeatureList::IsEnabled(kLibvpxUseChromeThreads)) {
-      InitLibVpxThreadWrapper();
-    }
 #endif  // BUILDFLAG(ENABLE_LIBVPX)
 #if BUILDFLAG(ENABLE_LIBAOM)
-    if (base::FeatureList::IsEnabled(kLibaomUseChromeThreads)) {
-      InitLibAomThreadWrapper();
-    }
 #endif  // BUILDFLAG(ENABLE_LIBAOM)
   }