Remove PulseAudio 48553 suppression

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 08cdbb84ae8487a4f44e8b2f5c436d9133bddb33..5e4e3479eb9ce86570adef17cae641a9fd41dabd 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -3438,25 +3438,6 @@
    fun:_ZN9OptionsUIC1EP11TabContents
 }
 {
-   bug_48553
-   Memcheck:Leak
-   fun:malloc
-   fun:malloc
-   fun:pa_xmalloc
-   obj:/usr/lib/libpulse.so.0.4.1
-   ...
-   fun:_ZN8chromeos15PulseAudioMixer14PulseAudioInitEv
-   fun:_ZN8chromeos15PulseAudioMixer6DoInitEP14CallbackRunnerI6Tuple1IbEE
-   fun:_Z16DispatchToMethodIN8chromeos15PulseAudioMixerEMS1_FvP14CallbackRunnerI6Tuple1IbEEES6_EvPT_T0_RKS3_IT1_E
-   fun:_ZN14RunnableMethodIN8chromeos15PulseAudioMixerEMS1_FvP14CallbackRunnerI6Tuple1IbEEES3_IS6_EE3RunEv
-   fun:_ZN11MessageLoop7RunTaskEP4Task
-   fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
-   fun:_ZN11MessageLoop6DoWorkEv
-   fun:_ZN4base18MessagePumpDefault3RunEPNS_11MessagePump8DelegateE
-   fun:_ZN11MessageLoop11RunInternalEv
-   fun:_ZN11MessageLoop10RunHandlerEv
-}
-{
    bug_48557_1
    Memcheck:Leak
    fun:_Znw*