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

in chromeos_unittests

TBR=stevenjb@chromium.org
BUG=392936
TEST=waterfall.sh

Review URL: https://codereview.chromium.org/387663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282399 0039d316-1c4b-4281-b951-d872f2087c98

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
+}