Suppress a new leak in net::DnsReloadTimer::Expired().

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 13c10f53bfb0e3952824479874bc22fbdbfc2100..d8871b16916cb984274f40d14a8e9abd18f020d2 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -3590,3 +3590,15 @@
    fun:_ZN7Browser16InitCommandStateEv
    fun:_ZN7Browser*ENS_4TypeEP7Profile
 }
+{
+   bug_50579
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN3net14DnsReloadTimer7ExpiredEv
+   fun:_ZN3net24DnsReloadTimerHasExpiredEv
+   fun:_ZN3net22SystemHostResolverProcERKSsNS_13AddressFamilyEiPNS_11AddressListEPi
+   fun:_ZN3net15ResolveAddrInfoEPNS_16HostResolverProcERKSsNS_13AddressFamilyEiPNS_11AddressListEPi
+   fun:_ZN3net16HostResolverImpl3Job8DoLookupEv
+   fun:_Z16DispatchToMethodIN3net16HostResolverImpl3JobEMS2_FvvEEvPT_T0_RK6Tuple0
+   fun:_ZN14RunnableMethodIN3net16HostResolverImpl3JobEMS2_FvvE6Tuple0E3RunEv
+}