Valgrind: Suppress a leak in disk_cache::SimpleBackendImpl::CreateEntry

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 # running overnight and removing outdated bugs/suppressions.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 3467 matching lines @@
    fun:_ZN5blink26RefCountedGarbageCollectedINS_15StyleFilterDataEE3refEv
    ...
    fun:_ZN5blink7DataRefINS_15StyleFilterDataEE4initEv
    ...
    fun:_ZN5blink13ComputedStyle6createEv
    fun:_ZN5blink13StyleResolver16styleForDocumentERNS_8DocumentE
    fun:_ZN5blink8Document6attachERKNS_4Node13AttachContextE
    fun:_ZN5blink14LocalDOMWindow18installNewDocumentERKN3WTF6StringERKNS_12DocumentInitEb
    fun:_ZN5blink14DocumentLoader15createWriterForEPKNS_*
 }
+{
+   bug_581959
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN9__gnu_cxx13new_allocatorIPN10disk_cache20SimpleEntryOperationEE8allocateEmPKv
+   fun:_ZNSt11_Deque_baseIN10disk_cache20SimpleEntryOperationESaIS1_EE15_M_allocate_mapEm
+   fun:_ZNSt11_Deque_baseIN10disk_cache20SimpleEntryOperationESaIS1_EE17_M_initialize_mapEm
+   fun:_ZNSt11_Deque_baseIN10disk_cache20SimpleEntryOperationESaIS1_EEC2Ev
+   fun:_ZNSt5dequeIN10disk_cache20SimpleEntryOperationESaIS1_EEC2Ev
+   fun:_ZN10disk_cache15SimpleEntryImplC1EN3net9CacheTypeERKN4base8FilePathEmNS0_14OperationsModeEPNS_17SimpleBackendImplEPNS1_6NetLogE
+   fun:_ZN10disk_cache17SimpleBackendImpl23CreateOrFindActiveEntryEmRKSs
+   fun:_ZN10disk_cache17SimpleBackendImpl11CreateEntryERKSsPPNS_5EntryERKN4base8CallbackIFviEEE
+}