Fix a memory leak in net::CertVerifyProcMac::VerifyInternal

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 241 matching lines @@
    fun:_ZN7content45PluginLoaderPosixTest_PluginLaunchFailed_TestC1Ev
    fun:_ZN7testing8internal15TestFactoryImplIN7content45PluginLoaderPosixTest_PluginLaunchFailed_TestEE10CreateTestEv
 }
 {
    bug_437807
    Memcheck:Leak
    ...
    fun:_ZN4base3mac30PathForFrameworkBundleResourceEPK10__CFString
    fun:_ZN3gin13IsolateHolder14LoadV8SnapshotEv
 }
-{
-   bug_455533
-   Memcheck:Leak
-   fun:malloc_zone_malloc
-   fun:_CFRuntimeCreateInstance
-   fun:__CFArrayInit
-   fun:_ZNK3net15X509Certificate24CreateOSCertChainForCertEv
-   fun:_ZN3net17CertVerifyProcMac14VerifyInternalEPNS_15X509CertificateERKSsiPNS_6CRLSetERKSt6vectorI13scoped_refptrIS1_ESaIS9_EEPNS_16CertVerifyResultE
-   fun:_ZN3net14CertVerifyProc6VerifyEPNS_15X509CertificateERKSsiPNS_6CRLSetERKSt6vectorI13scoped_refptrIS1_ESaIS9_EEPNS_16CertVerifyResultE
-}