Suppress memory leak in HostResolverImplChromeOS

BUG=386418
TBR=stevenjb@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/340953005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278270 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -6378,3 +6378,13 @@
    fun:_ZN7WebCore11ImageLoader19doUpdateFromElementEb
    fun:_ZN7WebCore11ImageLoader4Task3runEv
 }
+{
+   bug_386418
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN4base8internal20PostTaskAndReplyImpl16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEESA_
+   fun:_ZN4base10WorkerPool16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEES9_b
+   fun:_ZN3net16HostResolverImpl16LoopbackProbeJobC1ERKN4base7WeakPtrIS0_EE
+   fun:_ZN3net16HostResolverImplC1ERKNS_12HostResolver7OptionsEPNS_6NetLogE
+   fun:_ZN8chromeos24HostResolverImplChromeOSC1E13*
+}