H264: Don't disable compiler warning by using NO_THREAD_SAFETY_ANALYSIS.

webrtc/modules/video_coding/BUILD.gn

Index: webrtc/modules/video_coding/BUILD.gn
diff --git a/webrtc/modules/video_coding/BUILD.gn b/webrtc/modules/video_coding/BUILD.gn
index 3f06c4d73ec2cb87078e526510444c98be2c5c59..cab7ad207e1aedf91e76510cd776ad3761d5696f 100644
--- a/webrtc/modules/video_coding/BUILD.gn
+++ b/webrtc/modules/video_coding/BUILD.gn
@@ -146,13 +146,6 @@ rtc_static_library("video_coding_utility") {
   ]
 }
 
-# TODO(ehmaldonado): Remove once http://bugs.webrtc.org/8090 is fixed.
-config("webrtc_h264_config") {
-  if (is_clang) {
-    cflags = [ "-Wno-thread-safety-attributes" ]
-  }
-}
-
 rtc_static_library("webrtc_h264") {
   sources = [
     "codecs/h264/h264.cc",
@@ -173,7 +166,6 @@ rtc_static_library("webrtc_h264") {
   ]
 
   if (rtc_use_h264) {
-    configs += [ ":webrtc_h264_config" ]
     defines += [ "WEBRTC_USE_H264" ]
     if (rtc_initialize_ffmpeg) {
       defines += [ "WEBRTC_INITIALIZE_FFMPEG" ]