Implement store as an explicit atomic operation.

webrtc/system_wrappers/source/trace_impl.cc

Index: webrtc/system_wrappers/source/trace_impl.cc
diff --git a/webrtc/system_wrappers/source/trace_impl.cc b/webrtc/system_wrappers/source/trace_impl.cc
index e6032d507ecdc79477f56c0673534a24339dd3f2..25da5a0c9ac61ee9fd718fc863b705ae7b16a815 100644
--- a/webrtc/system_wrappers/source/trace_impl.cc
+++ b/webrtc/system_wrappers/source/trace_impl.cc
@@ -542,12 +542,12 @@ int32_t Trace::TraceFile(char file_name[FileWrapper::kMaxFileNameSize]) {
 
 // static
 void Trace::set_level_filter(int filter) {
-  rtc::AtomicOps::Store(&level_filter_, filter);
+  rtc::AtomicOps::ReleaseStore(&level_filter_, filter);
 }
 
 // static
 int Trace::level_filter() {
-  return rtc::AtomicOps::Load(&level_filter_);
+  return rtc::AtomicOps::AcquireLoad(&level_filter_);
 }
 
 // static