Valgrind: Suppress a leak in TaskClosureAdapter.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 86296)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -4607,6 +4607,15 @@
    fun:_ZNK4base8CallbackIFvvEE3RunEv
    fun:_ZN11MessageLoop7RunTaskERKNS_11PendingTaskE
 }
+{
+   bug_83609
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN4base4BindIMN12_GLOBAL__N_118TaskClosureAdapterEFvvEPS2_EENS_8internal20InvokerStorageHolderINS6_15InvokerStorage1IT_T0_EEEES9_RKSA_
+   fun:_ZN11MessageLoop15PostDelayedTaskERKN15tracked_objects8LocationEP4Taskx
+   fun:_ZN13BrowserThread14PostTaskHelperENS_2IDERKN15tracked_objects8LocationEP4Taskxb
+   fun:_ZN13BrowserThread8PostTaskENS_2IDERKN15tracked_objects8LocationEP4Task
+}
 #-----------------------------------------------------------------------
 # These only occur on our Google workstations
 {