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

ipc/ipc_sync_channel_unittest.cc

Index: ipc/ipc_sync_channel_unittest.cc
diff --git a/ipc/ipc_sync_channel_unittest.cc b/ipc/ipc_sync_channel_unittest.cc
index f834ec3b5bb3da95067456d6c1cc1ba0ee17d739..43512ab12e7c2df432b48ffb7a146abdceb7c780 100644
--- a/ipc/ipc_sync_channel_unittest.cc
+++ b/ipc/ipc_sync_channel_unittest.cc
@@ -1722,7 +1722,11 @@ class VerifiedServer : public Worker {
     VLOG(1) << __FUNCTION__ << " Sending reply: " << reply_text_;
     SyncChannelNestedTestMsg_String::WriteReplyParams(reply_msg, reply_text_);
     Send(reply_msg);
-    ASSERT_EQ(channel()->GetPeerPID(), base::GetCurrentProcId());
+#if defined(OS_LINUX) || defined(OS_NACL_NONSFI)
+    ASSERT_EQ(-1, channel()->GetPeerPID());
+#else
+    ASSERT_EQ(base::GetCurrentProcId(), channel()->GetPeerPID());
+#endif
     Done();
   }
 
@@ -1751,7 +1755,11 @@ class VerifiedClient : public Worker {
     (void)expected_text_;
 
     VLOG(1) << __FUNCTION__ << " Received reply: " << response;
-    ASSERT_EQ(channel()->GetPeerPID(), base::GetCurrentProcId());
+#if defined(OS_LINUX) || defined(OS_NACL_NONSFI)
+    ASSERT_EQ(-1, channel()->GetPeerPID());
+#else
+    ASSERT_EQ(base::GetCurrentProcId(), channel()->GetPeerPID());
+#endif
     Done();
   }