Valgrind: Suppress a leak in ThreadWatcher::PostPingMessage.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 86145)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -4603,6 +4603,19 @@
    fun:_ZNK4base8CallbackIFvvEE3RunEv
    fun:_ZN11MessageLoop7RunTaskERKNS_11PendingTaskE
 }
+{
+   bug_83430
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN27ScopedRunnableMethodFactoryI13ThreadWatcherE17NewRunnableMethodIMS0_FvyEyEEP14CancelableTaskT_RKT0_
+   fun:_ZN13ThreadWatcher15PostPingMessageEv
+   fun:_Z16DispatchToMethodI13ThreadWatcherMS0_FvvEEvPT_T0_RK6Tuple0
+   fun:_ZN27ScopedRunnableMethodFactoryI13ThreadWatcherE14RunnableMethodIMS0_FvvE6Tuple0E3RunEv
+   fun:_ZN12_GLOBAL__N_118TaskClosureAdapter3RunEv
+   fun:_ZN4base8internal8Invoker1ILb0ENS0_15InvokerStorage1IMN12_GLOBAL__N_118TaskClosureAdapterEFvvEPS4_EES6_E8DoInvokeEPNS0_18InvokerStorageBaseE
+   fun:_ZNK4base8CallbackIFvvEE3RunEv
+   fun:_ZN11MessageLoop7RunTaskERKNS_11PendingTaskE
+}
 #-----------------------------------------------------------------------
 # These only occur on our Google workstations
 {