Non-SFI mode: Use dummy PID for NaCl's IPC channel for nacl_helper_nonsfi.

ipc/ipc_channel.cc

Index: ipc/ipc_channel.cc
diff --git a/ipc/ipc_channel.cc b/ipc/ipc_channel.cc
index 4a4e40ddc1fb82bfa2bbeeff49cf0917b252ef7a..ac09c5ab1ef1d00b31c4f3a2e7b0a260673dbfbe 100644
--- a/ipc/ipc_channel.cc
+++ b/ipc/ipc_channel.cc
@@ -28,8 +28,13 @@ std::string Channel::GenerateUniqueRandomChannelID() {
   // the creator, an identifier for the child instance, and a strong random
   // component. The strong random component prevents other processes from
   // hijacking or squatting on predictable channel names.
-
+#if defined(OS_NACL_NONSFI)
+  // The seccomp sandbox disallows use of getpid(), so we provide a
+  // dummy PID.
+  int process_id = -1;
+#else
   int process_id = base::GetCurrentProcId();
+#endif
   return base::StringPrintf("%d.%u.%d",
       process_id,
       g_last_id.GetNext(),