ThreadLogMessages: don’t check TLS slot initialization return value

util/thread/thread_log_messages.cc

Index: util/thread/thread_log_messages.cc
diff --git a/util/thread/thread_log_messages.cc b/util/thread/thread_log_messages.cc
index f3af8a8371df3b53088a7df01b7b55fdbf25ce34..bada15a2b7ce5695aca8f93cf1624d6381f2e2b9 100644
--- a/util/thread/thread_log_messages.cc
+++ b/util/thread/thread_log_messages.cc
@@ -36,7 +36,8 @@ class ThreadLogMessagesMaster {
  public:
   ThreadLogMessagesMaster() {
     DCHECK(!tls_.initialized());
-    CHECK(tls_.Initialize(nullptr));
+    tls_.Initialize(nullptr);
+    DCHECK(tls_.initialized());
 
     DCHECK(!logging::GetLogMessageHandler());
     logging::SetLogMessageHandler(LogMessageHandler);