Valgrind: Suppress a leak in ThreadWatcher::PostPingMessage.

tools/valgrind/memcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 4585 matching lines @@
    fun:_Znw*
    fun:_ZN13ThreadWatcher13StartWatchingERKN13BrowserThread2IDERKSsRKN4base9TimeDeltaES9_
    fun:_ZN17ThreadWatcherList16StartWatchingAllEv
    fun:_Z18DispatchToFunctionIPFvvEEvT_RK6Tuple0
    fun:_ZN16RunnableFunctionIPFvvE6Tuple0E3RunEv
    fun:_ZN12_GLOBAL__N_118TaskClosureAdapter3RunEv
    fun:_ZN4base8internal8Invoker1ILb0ENS0_15InvokerStorage1IMN12_GLOBAL__N_118TaskClosureAdapterEFvvEPS4_EES6_E8DoInvokeEPNS0_18InvokerStorageBaseE
    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
 {
    bug_todo_freeres
    Memcheck:Free
    fun:free
    fun:__libc_freeres
    fun:_vgnU_freeres
    fun:_Exit
    fun:exit
 }
 {
    bug_todo_getdelim
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    ...
    fun:call_init
    fun:_dl_init
 }