Add a couple of suppressions to make the MFYI waterfall greener

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index 205718e04931838a5a4275d4687526a75bf97a4c..b1d438b3445a987c222954dc2bd4a4cae5981858 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -6544,3 +6544,19 @@
    fun:_ZN7WebCore14RenderReplaced5paintERNS_9PaintInfoERKNS_11LayoutPointE
    fun:_ZN7WebCore11RenderBlock18paintAsInlineBlockEPNS_12RenderObjectERNS_9PaintInfoERKNS_11LayoutPointE
 }
+{
+   bug_381584
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN4base8internal20PostTaskAndReplyImpl16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEESA_
+   fun:_ZN4base10TaskRunner16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEES9_
+   fun:_ZN4base26PostTaskAndReplyWithResultI13scoped_refptrIN8chromeos8OwnerKeyEES4_EEbPNS_10TaskRunnerERKN15tracked_objects8LocationERKNS_8CallbackIFT_vEEERKNSB_IFvT0_EEE
+   fun:_ZN8chromeos23SessionManagerOperation14EnsureOwnerKeyERKN4base8CallbackIFvvEEE
+   fun:_ZN8chromeos23SessionManagerOperation12StartLoadingEv
+   fun:_ZN8chromeos21LoadSettingsOperation3RunEv
+   fun:_ZN8chromeos23SessionManagerOperation5StartEPNS_20SessionManagerClientE13scoped_refptrINS_12OwnerKeyUtilEES3_INS_8OwnerKeyEE
+   fun:_ZN8chromeos21DeviceSettingsService18StartNextOperationEv
+   fun:_ZN8chromeos21DeviceSettingsService7EnqueueEPNS_23SessionManagerOperationE
+   fun:_ZN8chromeos21DeviceSettingsService11EnqueueLoadEb
+   fun:_ZN8chromeos21DeviceSettingsService4LoadEv
+}