Suppress an UnlockForeign report on TSan/UI FYI bot

tools/valgrind/tsan/suppressions.txt

 ############################
 # Chromium
 
 {
   bug_23433
   ThreadSanitizer:Race
   fun:*logging*SetMinLogLevel*
 }
 
 {
@@ skipping 127 matching lines @@
   fun:talk_base::PosixSignalDeliveryDispatcher::ClearOwner(talk_base::PhysicalSocketServer*)
   fun:talk_base::PhysicalSocketServer::~PhysicalSocketServer()
   fun:scoped_ptr<talk_base::SocketServer>::~scoped_ptr()
   fun:talk_base::MessageQueue::~MessageQueue()
   fun:talk_base::Thread::~Thread()
   fun:talk_base::ThreadManager::UnwrapCurrentThread()
   fun:talk_base::ThreadManager::~ThreadManager()
   fun:__tcf_0
   fun:exit
 }
+
+{
+  bug_61585
+  ThreadSanitizer:UnlockForeign
+  fun:pthread_mutex_destroy
+  ...
+  fun:NSS_Shutdown
+  ...
+  fun:*AtExitManager*
+}
+
 ############################
 # Data races in tests
 
 {
   bug_30582
   ThreadSanitizer:Race
   fun:*LongCallbackD*
   fun:*WorkerThreadTickerTest_LongCallback_Test*TestBody*
 }
 
@@ skipping 179 matching lines @@
   ThreadSanitizer:Race
   ...
   fun:gethostbyname2_r*
 }
 
 {
   Benign race in nss (PR_EnterMonitor)
   ThreadSanitizer:Race
   fun:PR_EnterMonitor
 }