Update valgrind suppressions for mac_util::SetFileBackupExclusion leaks.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index 05cfd73e88902288512dc6b9138e00aeec8a8c63..6ff26b7c8193dc5032c4fd0adaa6b75e890eee68 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -1692,32 +1692,6 @@
    fun:_ZN11MessageLoop10RunHandlerEv
 }
 {
-   bug_28072
-   Memcheck:Leak
-   fun:malloc_zone_malloc
-   fun:_CFRuntimeCreateInstance
-   fun:__CFStringCreateImmutableFunnel3
-   fun:CFStringCreateWithBytes
-   fun:__CFBinaryPlistCreateObject2
-   fun:__CFBinaryPlistCreateObject2
-   fun:__CFBinaryPlistCreateObject2
-   fun:__CFTryParseBinaryPlist
-   fun:_CFPropertyListCreateFromXMLData
-   fun:CFPropertyListCreateFromStream
-   fun:+[CFXPreferencesPropertyListSource createPlistFromFile:statInfo:]
-   fun:-[CFXPreferencesPropertyListSource synchronize]
-   fun:CFPreferencesSynchronize
-   fun:_CSBackupSettingsExcludePath
-   fun:CSBackupSetItemExcluded
-   fun:_ZN8mac_util22SetFileBackupExclusionERK8FilePathb
-   fun:_ZN7history15HistoryDatabase4InitERK8FilePathS3_
-   fun:_ZN7history14HistoryBackend8InitImplEv
-   fun:_ZN7history14HistoryBackend4InitEb
-   fun:_Z16DispatchToMethodIN7history14HistoryBackendEMS1_FvbEbEvPT_T0_RK6Tuple1IT1_E
-   fun:_ZN14RunnableMethodIN7history14HistoryBackendEMS1_FvbE6Tuple1IbEE3RunEv
-   fun:_ZN11MessageLoop7RunTaskEP4Task
-}
-{
    bug_28200
    Memcheck:Leak
    fun:malloc