Remove suppression for SocketStreamTest.CloseFlushPendingWrite

tools/valgrind/memcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 3739 matching lines @@
    fun:_ZN3IPC11SyncChannel20ReceivedSyncMsgQueue16DispatchMessagesEv
 }
 {
    bug_50968
    Memcheck:Leak
    ...
    fun:_ZN14WebDataService29InitializeDatabaseIfNecessaryEv
    fun:_Z16DispatchToMethodI14WebDataServiceMS0_FvvEEvPT_T0_RK6Tuple0
 }
 {
-   bug_51055
-   Memcheck:Addr4
-   ...
-   fun:_ZN7testing8internal11CmpHelperEQIN17SocketStreamEvent9EventTypeES3_EENS_15AssertionResultEPKcS6_RKT_RKT0_
-   fun:_ZN7testing8internal8EqHelperILb0EE7CompareIN17SocketStreamEvent9EventTypeES5_EENS_15AssertionResultEPKcS8_RKT_RKT0_
-   fun:_ZN3net44SocketStreamTest_CloseFlushPendingWrite_Test8TestBodyEv
-}
-{
    bug_51057_a
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN3net22HttpNetworkTransaction16DoInitConnectionEv
    fun:_ZN3net22HttpNetworkTransaction6DoLoopEi
    fun:_ZN3net22HttpNetworkTransaction5StartEPKNS_15HttpRequestInfoEP14CallbackRunnerI6Tuple1IiEERKNS_11BoundNetLogE
    fun:_ZN3net9HttpCache11Transaction13DoSendRequestEv
    fun:_ZN3net9HttpCache11Transaction6DoLoopEi
    fun:_ZN3net9HttpCache11Transaction12OnIOCompleteEi
@@ skipping 349 matching lines @@
    bug_52387
    Memcheck:Addr4
    fun:_ZN12_GLOBAL__N_112CacheCreator10DoCallbackEi
    fun:_ZN12_GLOBAL__N_112CacheCreator12OnIOCompleteEi
    fun:_Z16DispatchToMethodIN12_GLOBAL__N_112CacheCreatorEMS1_FviEiEvPT_T0_RK6Tuple1IT1_E
    fun:_ZN14CallbackRunnerI6Tuple1IiEE3RunIiEEvRKT_
    fun:_ZN10disk_cache17InFlightBackendIO19OnOperationCompleteEPNS_12BackgroundIOEb
    fun:_ZN10disk_cache10InFlightIO14InvokeCallbackEPNS_12BackgroundIOEb
    fun:_ZN10disk_cache12BackgroundIO13OnIOSignalledEv
 }