message: Fix NetBSD build for r343409
  Forgot to remove the method declaration from the header.
diff: @@ -112,7 +112,6 @@ private:
  void MonitorSIGTRAP(lldb::pid_t pid);
  void MonitorSignal(lldb::pid_t pid, int signal);
  - Status GetSoftwareBreakpointPCOffset(uint32_t &actual_opcode_size);
  Status FixupBreakpointPCAsNeeded(NativeThreadNetBSD &thread);
  Status PopulateMemoryRegionCache();
  void SigchldHandler();
  