Remove suppression for non-existing test.

tools/valgrind-webrtc/memcheck/suppressions.txt

 # This file is used in addition to the one already maintained in Chrome.
 # It acts as a place holder for future additions for WebRTC.
 # It must exist for the Python wrapper script to work properly.
 
 # There are three kinds of suppressions in this file.
 # 1. third_party libraries
 # 2. webrtc stuff
 # 3. libjingle stuff (talk folder)
 #-----------------------------------------------------------------------
 
@@ skipping 252 matching lines @@
 {
    ignore_common_benevolent_trace_library_errors
    Memcheck:Uninitialized
    ...
    fun:vsnprintf
    fun:_ZN6webrtc5Trace3AddENS_10TraceLevelENS_11TraceModuleEiPKcz
    ...
 }
 
 {
-   ignore_leak_when_alsa_hits_error
-   Memcheck:Leak
-   ...
-   fun:snd_device_name_hint
-   fun:_ZNK6webrtc20AudioDeviceLinuxALSA14GetDevicesInfoEibiPci
-   fun:_ZN6webrtc20AudioDeviceLinuxALSA16SetPlayoutDeviceEt
-   fun:_ZN6webrtc21AudioDeviceModuleImpl16SetPlayoutDeviceEt
-   fun:_ZN6webrtc11VoEBaseImpl4InitEPNS_17AudioDeviceModuleE
-   fun:_ZN11ViEAutoTest19ViEFileStandardTestEv
-   fun:_ZN12_GLOBAL__N_157ViEStandardIntegrationTest_RunsFileTestWithoutErrors_Test8TestBodyEv
-}
-
-{
    bug_270_1
    Memcheck:Uninitialized
    ...
    fun:WebRtcNetEQ_RecOutInternal
    fun:WebRtcNetEQ_RecOut
    ...
 }
 
 {
    bug_270_2
@@ skipping 174 matching lines @@
    fun:_ZN3rtc12_GLOBAL__N_122CreateClientConnectionERNS_10HttpServerERNS0_17HttpServerMonitorEb
    fun:_ZN3rtc47HttpServer_SignalsCloseAfterForcedCloseAll_Test8TestBodyEv
 }
 {
    bug_5989
    Memcheck:Unaddressable
    ...
    fun:_ZNK3rtc15CriticalSection5EnterEv
    ...
 }