Suppress leak in Blink on mac valgrind bot

BUG=320918
TBR=eseidel@chromium.org

Review URL: https://codereview.chromium.org/66593005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235868 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions_mac.txt

@@ -2347,3 +2347,16 @@
    fun:_ZN7WebCore*TerminatedArrayBuilder*
    fun:_ZN7WebCore7RuleSet19compactPendingRules*
 }
+{
+   bug_320918
+   Memcheck:Leak
+   fun:malloc
+   fun:_ZN3WTF10fastMallocEm
+   fun:_ZN3WTF11LinkedStackIN7WebCore8RuleDataEEnwEm
+   fun:_ZN7WebCore7RuleSet12addToRuleSet*
+   fun:_ZN7WebCore7RuleSet21findBestRuleSetAndAdd*
+   fun:_ZN7WebCore7RuleSet7addRule*
+   fun:_ZN7WebCore7RuleSet13addChildRules*
+   fun:_ZN7WebCore7RuleSet17addRulesFromSheet*
+   fun:_ZN7WebCore21CSSDefaultStyleSheets16loadDefaultStyle*
+}