Implement IPC::ChannelFactory, a class that accept()s on a UNIX socket.

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 38e14ef14b684f5fc7f76a1386b4a4aae91ff403..6378c3306854a0a90471ec8015d70b31fcfdf726 100644
--- a/ipc/ipc_channel_posix.h
+++ b/ipc/ipc_channel_posix.h
@@ -63,7 +63,7 @@ class Channel::ChannelImpl : public internal::ChannelReader,
   void CloseClientFileDescriptor();
   bool AcceptsConnections() const;
   bool HasAcceptedConnection() const;
-  bool GetClientEuid(uid_t* client_euid) const;
+  bool GetPeerEuid(uid_t* peer_euid) const;
   void ResetToAcceptingConnectionState();
   base::ProcessId peer_pid() const { return peer_pid_; }
   static bool IsNamedServerInitialized(const std::string& channel_id);
@@ -194,12 +194,6 @@ class Channel::ChannelImpl : public internal::ChannelReader,
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelImpl);
 };
 
-// The maximum length of the name of a pipe for MODE_NAMED_SERVER or
-// MODE_NAMED_CLIENT if you want to pass in your own socket.
-// The standard size on linux is 108, mac is 104. To maintain consistency
-// across platforms we standardize on the smaller value.
-static const size_t kMaxPipeNameLength = 104;
-
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_