Delete all of the video_processing module but the denoiser code.

webrtc/modules/video_processing/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/arm.gni")
 import("../../build/webrtc.gni")
 
 build_video_processing_sse2 = current_cpu == "x86" || current_cpu == "x64"
 
 rtc_static_library("video_processing") {
   sources = [
-    "frame_preprocessor.cc",
-    "frame_preprocessor.h",
-    "include/video_processing.h",
-    "include/video_processing_defines.h",
-    "spatial_resampler.cc",
-    "spatial_resampler.h",
     "util/denoiser_filter.cc",
     "util/denoiser_filter.h",
     "util/denoiser_filter_c.cc",
     "util/denoiser_filter_c.h",
     "util/noise_estimation.cc",
     "util/noise_estimation.h",
     "util/skin_detection.cc",
     "util/skin_detection.h",
-    "video_decimator.cc",
-    "video_decimator.h",
     "video_denoiser.cc",
     "video_denoiser.h",
-    "video_processing_impl.cc",
-    "video_processing_impl.h",
   ]
 
   deps = [
     "../../common_audio",
     "../../common_video",
     "../../modules/utility",
     "../../system_wrappers",
   ]
   if (build_video_processing_sse2) {
     deps += [ ":video_processing_sse2" ]
@@ skipping 31 matching lines @@
     sources = [
       "util/denoiser_filter_neon.cc",
       "util/denoiser_filter_neon.h",
     ]
     if (current_cpu != "arm64") {
       suppressed_configs += [ "//build/config/compiler:compiler_arm_fpu" ]
       cflags = [ "-mfpu=neon" ]
     }
   }
 }