Use ChannelMojo between app shims and the browser process.

chrome/browser/apps/app_shim/unix_domain_socket_acceptor.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_APPS_APP_SHIM_UNIX_DOMAIN_SOCKET_ACCEPTOR_H_
 #define CHROME_BROWSER_APPS_APP_SHIM_UNIX_DOMAIN_SOCKET_ACCEPTOR_H_
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
-#include "ipc/ipc_channel_handle.h"
+#include "mojo/edk/embedder/named_platform_handle.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
 
 namespace apps {
 
 // A UnixDomainSocketAcceptor listens on a UNIX domain socket. When a
 // client connects to the socket, it accept()s the connection and
 // passes the new FD to the delegate. The delegate is then responsible
 // for creating a new IPC::Channel for the FD.
 class UnixDomainSocketAcceptor : public base::MessageLoopForIO::Watcher {
  public:
   class Delegate {
    public:
     // Called when a client connects to the factory. It is the delegate's
     // responsibility to create an IPC::Channel for the handle, or else close
     // the file descriptor contained therein.
-    virtual void OnClientConnected(const IPC::ChannelHandle& handle) = 0;
+    virtual void OnClientConnected(mojo::edk::ScopedPlatformHandle handle) = 0;
 
     // Called when an error occurs and the channel is closed.
     virtual void OnListenError() = 0;
   };
 
   UnixDomainSocketAcceptor(const base::FilePath& path, Delegate* delegate);
 
   ~UnixDomainSocketAcceptor() override;
 
   // Call this to start listening on the socket.
   bool Listen();
 
   // Close and unlink the socket, and stop accepting connections.
   void Close();
 
  private:
-  bool CreateSocket();
   void OnFileCanReadWithoutBlocking(int fd) override;
   void OnFileCanWriteWithoutBlocking(int fd) override;
 
   base::MessageLoopForIO::FileDescriptorWatcher
       server_listen_connection_watcher_;
-  base::FilePath path_;
+  mojo::edk::NamedPlatformHandle named_pipe_;
   Delegate* delegate_;
-  int listen_fd_;
+  mojo::edk::ScopedPlatformHandle listen_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(UnixDomainSocketAcceptor);
 };
 
 }  // namespace apps
 
 #endif  // CHROME_BROWSER_APPS_APP_SHIM_UNIX_DOMAIN_SOCKET_ACCEPTOR_H_