GN: Change rtc_source_set targets --> rtc_static_library

webrtc/common_audio/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")
 
 config("common_audio_config") {
   include_dirs = [
     "resampler/include",
     "signal_processing/include",
     "vad/include",
   ]
 }
 
-rtc_source_set("common_audio") {
+rtc_static_library("common_audio") {
   sources = [
     "audio_converter.cc",
     "audio_converter.h",
     "audio_ring_buffer.cc",
     "audio_ring_buffer.h",
     "audio_util.cc",
     "blocker.cc",
     "blocker.h",
     "channel_buffer.cc",
     "channel_buffer.h",
@@ skipping 148 matching lines @@
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
   }
 
   if (current_cpu == "x86" || current_cpu == "x64") {
     deps += [ ":common_audio_sse2" ]
   }
 }
 
 if (current_cpu == "x86" || current_cpu == "x64") {
-  rtc_source_set("common_audio_sse2") {
+  rtc_static_library("common_audio_sse2") {
     sources = [
       "fir_filter_sse.cc",
       "resampler/sinc_resampler_sse.cc",
     ]
 
     if (is_posix) {
       cflags = [ "-msse2" ]
     }
 
     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 (rtc_build_with_neon) {
-  rtc_source_set("common_audio_neon") {
+  rtc_static_library("common_audio_neon") {
     sources = [
       "fir_filter_neon.cc",
       "resampler/sinc_resampler_neon.cc",
       "signal_processing/cross_correlation_neon.c",
       "signal_processing/downsample_fast_neon.c",
       "signal_processing/min_max_operations_neon.c",
     ]
 
     if (current_cpu != "arm64") {
       # Enable compilation for the NEON instruction set. This is needed
@@ skipping 75 matching lines @@
       "//testing/gtest",
     ]
 
     if (is_android) {
       deps += [ "//testing/android/native_test:native_test_support" ]
 
       shard_timeout = 900
     }
   }
 }