Suppress a leak of a CFMutableArray of certs in X509Certificate::Verify....

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 # running overnight and removing outdated bugs/suppressions.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 486 matching lines @@
 {
    bug_18984
    Memcheck:Free
    fun:_ZdlPv
    fun:_ZN7WebCore15CSSSelectorList19adoptSelectorVectorERN3WTF6VectorIPNS_11CSSSelectorELm0EEE
    ...
    fun:_ZN7WebCore9CSSParser15createStyleRuleEPN3WTF6VectorIPNS_11CSSSelectorELm0EEE
    fun:_Z10cssyyparsePv
    fun:_ZN7WebCore9CSSParser10parseSheetEPNS_13CSSStyleSheetERKNS_6StringE
 }
+{
+   # Leak of a CFMutableArray of certs in X509Certificate::Verify.
+   bug_20459
+   Memcheck:Leak
+   fun:malloc_zone_malloc
+   fun:_CFRuntimeCreateInstance
+   fun:__CFArrayInit
+   fun:CFArrayCreateMutableCopy
+   fun:_ZNK3net15X509Certificate6VerifyERKSsiPNS_16CertVerifyResultE
+   fun:_ZN3net12CertVerifier7Request8DoVerifyEv
+   fun:_ZN14RunnableMethodIN3net12CertVerifier7RequestEMS2_FvvE6Tuple0E3RunEv
+   fun:-[TaskOperation main]
+   fun:-[NSOperation start]
+   fun:__runop
+   fun:_pthread_wqthread
+   fun:start_wqthread
+}