Add one more suppression rule for tracked_objects.

tools/valgrind/memcheck/suppressions_mac.txt

Index: tools/valgrind/memcheck/suppressions_mac.txt
===================================================================
--- tools/valgrind/memcheck/suppressions_mac.txt	(revision 108066)
+++ tools/valgrind/memcheck/suppressions_mac.txt	(working copy)
@@ -1943,7 +1943,7 @@
    fun:__NSFontInstanceInfoInitializeMetricsInfo
 }
 {
-   bug_102327
+   bug_102327_a
    Memcheck:Addr1
    fun:_ZNK15tracked_objects10ThreadData26OnThreadTerminationCleanupEv
    fun:_ZN15tracked_objects10ThreadData19OnThreadTerminationEPv
@@ -1951,3 +1951,10 @@
    fun:_pthread_exit
    fun:thread_start
 }
+{
+   bug_102327_b
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN15tracked_objects10ThreadData10InitializeEv
+   fun:_ZN15tracked_objects10ThreadData23InitializeThreadContextERKSs
+}