GN: Change rtc_source_set targets --> rtc_static_library

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_source_set("video_processing") {
+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",
@@ skipping 24 matching lines @@
   }
 
   if (is_clang) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 }
 
 if (build_video_processing_sse2) {
-  rtc_source_set("video_processing_sse2") {
+  rtc_static_library("video_processing_sse2") {
     sources = [
       "util/denoiser_filter_sse2.cc",
       "util/denoiser_filter_sse2.h",
     ]
 
     if (is_clang) {
       # Suppress warnings from Chrome's Clang plugins.
       # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
 
     if (is_posix) {
       cflags = [ "-msse2" ]
     }
   }
 }
 
 if (rtc_build_with_neon) {
-  rtc_source_set("video_processing_neon") {
+  rtc_static_library("video_processing_neon") {
     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" ]
     }
   }
 }