suppress memory leak from base::internal::PostTaskAndReplyImpl::PostTaskAndReply

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 32d21f17107b6a2119732d8808ee2011cbce3e86..5aa553e314dc962d62dd246b45c634be9ddd3d2b 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -6242,3 +6242,15 @@
    fun:_ZN14SkBitmapDevice8drawPathERK6SkDrawRK6SkPathRK7SkPaintPK8SkMatrixb
    fun:_ZN8SkCanvas8drawPathERK6SkPathRK7SkPaint
 }
+{
+   bug_392936
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN4base8internal20PostTaskAndReplyImpl16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEESA_
+   fun:_ZN4base10WorkerPool16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEES9_b
+   fun:_ZN3net16HostResolverImpl16LoopbackProbeJobC2ERKN4base7WeakPtrIS0_EE
+   fun:_ZN3net16HostResolverImplC1ERKNS_12HostResolver7OptionsEPNS_6NetLogE
+   fun:_ZN8chromeos24HostResolverImplChromeOSC1E13scoped_refptrIN4base16MessageLoopProxyEEPNS_19NetworkStateHandlerERKN3net12HostResolver7OptionsEPNS7_6NetLogE
+   fun:_ZN8chromeos24HostResolverImplChromeOS25CreateHostResolverForTestE13scoped_refptrIN4base16MessageLoopProxyEEPNS_19NetworkStateHandlerE
+   fun:_ZN28HostResolverImplChromeOSTest22InitializeHostResolverEv
+}