GN: Change rtc_source_set targets --> rtc_static_library

webrtc/modules/remote_bitrate_estimator/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/webrtc.gni")
 
-rtc_source_set("remote_bitrate_estimator") {
+rtc_static_library("remote_bitrate_estimator") {
   sources = [
     "aimd_rate_control.cc",
     "aimd_rate_control.h",
     "bwe_defines.cc",
     "include/bwe_defines.h",
     "include/remote_bitrate_estimator.h",
     "include/send_time_history.h",
     "inter_arrival.cc",
     "inter_arrival.h",
     "overuse_detector.cc",
@@ skipping 27 matching lines @@
   }
 
   deps = [
     "../..:webrtc_common",
     "../../base:rtc_base_approved",
     "../../system_wrappers",
   ]
 }
 
 if (rtc_include_tests) {
-  rtc_source_set("bwe_simulator") {
+  rtc_static_library("bwe_simulator") {
     testonly = true
     sources = [
       "bwe_simulations.cc",
       "test/bwe.cc",
       "test/bwe.h",
       "test/bwe_test.cc",
       "test/bwe_test.h",
       "test/bwe_test_baselinefile.cc",
       "test/bwe_test_baselinefile.h",
       "test/bwe_test_fileutils.cc",
@@ skipping 38 matching lines @@
     }
 
     deps = [
       "../../test:test_support",
       "../pacing",
       "//testing/gmock",
       "//testing/gtest",
     ]
   }
 }