Non-SFI mode: Use dummy PID for NaCl's IPC channel on Linux platform.

ipc/ipc_channel_posix.h

Index: ipc/ipc_channel_posix.h
diff --git a/ipc/ipc_channel_posix.h b/ipc/ipc_channel_posix.h
index 1cb76102c3905eba818929ed536a73f47f048111..e543c16c61e1c723cfc1a365184305f7b105837d 100644
--- a/ipc/ipc_channel_posix.h
+++ b/ipc/ipc_channel_posix.h
@@ -85,9 +85,9 @@ class IPC_EXPORT ChannelPosix : public Channel,
   void CloseClientFileDescriptor();
 
   static bool IsNamedServerInitialized(const std::string& channel_id);
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_NACL_NONSFI)
   static void SetGlobalPid(int pid);
-#endif  // OS_LINUX
+#endif  // defined(OS_LINUX) || defined(OS_NACL_NONSFI)
 
  private:
   bool CreatePipe(const IPC::ChannelHandle& channel_handle);
@@ -212,10 +212,10 @@ class IPC_EXPORT ChannelPosix : public Channel,
   // True if we are responsible for unlinking the unix domain socket file.
   bool must_unlink_;
 
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) || defined(OS_NACL_NONSFI)
   // If non-zero, overrides the process ID sent in the hello message.
   static int global_pid_;
-#endif  // OS_LINUX
+#endif  // defined(OS_LINUX) || defined(OS_NACL_NONSFI)
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelPosix);
 };