GN: Change rtc_source_set targets --> rtc_static_library

webrtc/modules/audio_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("//third_party/protobuf/proto_library.gni")
 import("../../build/webrtc.gni")
 
 declare_args() {
   # Disables the usual mode where we trust the reported system delay
   # values the AEC receives. The corresponding define is set appropriately
   # in the code, but it can be force-enabled here for testing.
   aec_untrusted_delay_for_testing = false
 }
 
-rtc_source_set("audio_processing") {
+rtc_static_library("audio_processing") {
   sources = [
     "aec/aec_core.cc",
     "aec/aec_core.h",
     "aec/aec_core_optimized_methods.h",
     "aec/aec_rdft.cc",
     "aec/aec_rdft.h",
     "aec/aec_resampler.cc",
     "aec/aec_resampler.h",
     "aec/echo_cancellation.cc",
     "aec/echo_cancellation.h",
@@ skipping 215 matching lines @@
   proto_library("audioproc_debug_proto") {
     sources = [
       "debug.proto",
     ]
 
     proto_out_dir = "webrtc/modules/audio_processing"
   }
 }
 
 if (current_cpu == "x86" || current_cpu == "x64") {
-  rtc_source_set("audio_processing_sse2") {
+  rtc_static_library("audio_processing_sse2") {
     sources = [
       "aec/aec_core_sse2.cc",
       "aec/aec_rdft_sse2.cc",
     ]
 
     if (is_posix) {
       cflags = [ "-msse2" ]
     }
 
     if (apm_debug_dump) {
       defines = [ "WEBRTC_APM_DEBUG_DUMP=1" ]
     } else {
       defines = [ "WEBRTC_APM_DEBUG_DUMP=0" ]
     }
   }
 }
 
 if (rtc_build_with_neon) {
-  rtc_source_set("audio_processing_neon") {
+  rtc_static_library("audio_processing_neon") {
     sources = [
       "aec/aec_core_neon.cc",
       "aec/aec_rdft_neon.cc",
       "aecm/aecm_core_neon.cc",
       "ns/nsx_core_neon.c",
     ]
 
     if (current_cpu != "arm64") {
       # Enable compilation for the NEON instruction set. This is needed
       # since //build/config/arm.gni only enables NEON for iOS, not Android.
@@ skipping 160 matching lines @@
   }
 
   if (rtc_enable_protobuf) {
     proto_library("audioproc_unittest_proto") {
       sources = [
         "test/unittest.proto",
       ]
       proto_out_dir = "webrtc/modules/audio_processing"
     }
 
-    rtc_source_set("audioproc_protobuf_utils") {
+    rtc_static_library("audioproc_protobuf_utils") {
       sources = [
         "test/protobuf_utils.cc",
         "test/protobuf_utils.h",
       ]
 
       deps = [
         ":audioproc_debug_proto",
       ]
     }
   }
 }