Suppression memcheck:Addr4 error in chromium os valgrind(4) ui_test

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 f5b497ea6a7e660d1d390da3d62f949799508144..974da9a4388cf4b972be4f294a2f06dbb59b47e4 100755
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -2650,4 +2650,18 @@
    fun:_ZN11MessageLoop11RunInternalEv
    fun:_ZN11MessageLoop10RunHandlerEv
 }
-
+{
+   bug_40505
+   Memcheck:Addr4
+   fun:_ZN4base9TimeDeltaaSES0_
+   fun:_ZN10URLFetcher4Core21OnCompletedURLRequestERK16URLRequestStatus
+   fun:_Z16DispatchToMethodIN10URLFetcher4CoreEMS1_FvRK16URLRequestStatusES2_EvPT_T0_RK6Tuple1IT1_E
+   fun:_ZN14RunnableMethodIN10URLFetcher4CoreEMS1_FvRK16URLRequestStatusE6Tuple1IS2_EE3RunEv
+   fun:_ZN11MessageLoop7RunTaskEP4Task
+   fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
+   fun:_ZN11MessageLoop6DoWorkEv
+   fun:_ZN4base16MessagePumpForUI17RunWithDispatcherEPNS_11MessagePump8DelegateEPNS0_10DispatcherE
+   fun:_ZN11MessageLoop11RunInternalEv
+   fun:_ZN11MessageLoop10RunHandlerEv
+   fun:_ZN16MessageLoopForUI3RunEPN4base16MessagePumpForUI10DispatcherE
+}