Widen a suppression for a memory leak in remoting tests

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 # running overnight and removing outdated bugs/suppressions.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 3476 matching lines @@
    fun:_ZN3IPC11SyncChannel11SyncContext17OnMessageReceivedERKNS_7MessageE
    fun:_ZN3IPC7Channel11ChannelImpl23ProcessIncomingMessagesEv
    fun:_ZN3IPC7Channel11ChannelImpl28OnFileCanReadWithoutBlockingEi
    fun:_ZN4base19MessagePumpLibevent21FileDescriptorWatcher28OnFileCanReadWithoutBlockingEiPS0_
    fun:_ZN4base19MessagePumpLibevent22OnLibeventNotificationEisPv
 }
 {
    bug_46678
    Memcheck:Leak
    fun:_Znw*
-   fun:_Z11NewCallbackIN8remoting14SessionManagerEPNS0_11HostMessageEiEPN9Callback2IT0_T1_E4TypeEPT_MSA_FvS5_S6_E
+   fun:_Z11NewCallbackIN8remoting14SessionManager*
    fun:_ZN8remoting14SessionManager8DoEncodeE13scoped_refptrINS_11CaptureDataEE
    fun:_Z16DispatchToMethodIN8remoting14SessionManagerEMS1_Fv13scoped_refptrINS0_11CaptureDataEEES4_EvPT_T0_RK6Tuple1IT1_E
    fun:_ZN14RunnableMethodIN8remoting14SessionManagerEMS1_Fv13scoped_refptrINS0_11CaptureDataEEE6Tuple1IS4_EE3RunEv
    fun:_ZN11MessageLoop7RunTaskEP4Task
    ...
    fun:_ZN8remoting38SessionManagerTest_OneRecordCycle_Test8TestBodyEv
 }
 {
    bug_47331_part_1
    Memcheck:Leak
@@ skipping 717 matching lines @@
    fun:_ZN3net8internal26ClientSocketPoolBaseHelper20CancelAllConnectJobsEv
    fun:_ZN3net8internal26ClientSocketPoolBaseHelperD0Ev
    fun:_ZN4base10RefCountedIN3net8internal26ClientSocketPoolBaseHelperEE7ReleaseEv
    ...
    fun:_ZN13scoped_refptrIN3net8internal26ClientSocketPoolBaseHelperEED*Ev
    ...
    fun:_ZN3net20ClientSocketPoolBaseINS_15TCPSocketParamsEED*Ev
    fun:_ZN3net19TCPClientSocketPoolD0Ev
    fun:_ZN4base10RefCountedIN3net16ClientSocketPoolEE7ReleaseEv
 }