Add support for sockets that can listen and accept a connection.

ipc/ipc_switches.cc

Index: ipc/ipc_switches.cc
diff --git a/ipc/ipc_switches.cc b/ipc/ipc_switches.cc
index 2a8f470628d6032e6ff356a9076b1de4b914529c..bcb12256e5450098f0d3a418e282b5a6886614f0 100644
--- a/ipc/ipc_switches.cc
+++ b/ipc/ipc_switches.cc
@@ -11,10 +11,6 @@ namespace switches {
 // Can't find the switch you are looking for? try looking in
 // base/base_switches.cc instead.
 
-// On POSIX only: use FIFO for IPC channels so that "unrelated" process
-// can connect to a channel, provided it knows its name. For debugging purposes.
-const char kIPCUseFIFO[]                    = "ipc-use-fifo";
-
 // The value of this switch tells the child process which
 // IPC channel the browser expects to use to communicate with it.
 const char kProcessChannelID[]              = "channel";