Add one more suppression for a data race in libjingle

tools/valgrind/tsan/suppressions.txt

 ############################
 # Chromium
 
 {
   bug_21259
   ThreadSanitizer:Race
   ...
   fun:*tracked_objects*ThreadData*StartTracking*
 }
 
@@ skipping 90 matching lines @@
 
 {
   bug_25645 (WebKit)
   ThreadSanitizer:Race
   fun:*WTF*RefCountedBase*ref*
   ...
   fun:*WebCore*StringImpl*
 }
 
 {
-  bug_25913 (libjingle)
+  bug_25913 (libjingle) (1)
   ThreadSanitizer:Race
   fun:*talk_base*MessageQueue*Stop*
 }
 
+{
+  bug_25913 (libjingle) (2)
+  ThreadSanitizer:Race
+  fun:*talk_base*MessageQueue*Get*
+}
+
 ############################
 # Data races in tests
 
 # TODO(timurrrr): bug item
 {
   Data race on bool in base/thread_unittest
   ThreadSanitizer:Race
   ...
   fun:*ToggleValue*Run*
 }
@@ skipping 107 matching lines @@
   fun:tzset*
 }
 
 # Benign race in thread-safe function
 {
   fun:mkstemp*
   ThreadSanitizer:Race
   ...
   fun:mkstemp*
 }