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

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 6224 matching lines @@
    bug_392912
    Memcheck:Uninitialized
    fun:_ZNK8SkStroke10strokePathERK6SkPathPS0_
    fun:_ZNK11SkStrokeRec11applyToPathEP6SkPathRKS0_
    fun:_ZNK7SkPaint11getFillPathERK6SkPathPS0_PK6SkRect
    fun:_ZNK6SkDraw8drawPathERK6SkPathRK7SkPaintPK8SkMatrixbb
    fun:_ZNK6SkDraw8drawPathERK6SkPathRK7SkPaintPK8SkMatrixb
    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
+}