GN: Change rtc_source_set targets --> rtc_static_library

webrtc/test/fuzzers/BUILD.gn

 # Copyright (c) 2015 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/webrtc.gni")
 import("//build/config/features.gni")
@@ skipping 99 matching lines @@
 webrtc_fuzzer_test("congestion_controller_feedback_fuzzer") {
   sources = [
     "congestion_controller_feedback_fuzzer.cc",
   ]
   deps = [
     "../../:rtc_event_log",
     "../../modules/congestion_controller/",
   ]
 }
 
-rtc_source_set("audio_decoder_fuzzer") {
+rtc_static_library("audio_decoder_fuzzer") {
   sources = [
     "audio_decoder_fuzzer.cc",
     "audio_decoder_fuzzer.h",
   ]
 }
 
 webrtc_fuzzer_test("audio_decoder_ilbc_fuzzer") {
   sources = [
     "audio_decoder_ilbc_fuzzer.cc",
   ]
@@ skipping 95 matching lines @@
 }
 
 webrtc_fuzzer_test("pseudotcp_parser_fuzzer") {
   sources = [
     "pseudotcp_parser_fuzzer.cc",
   ]
   deps = [
     "../../p2p:rtc_p2p",
   ]
 }