Use ChannelMojo for remote security key channels.

remoting/host/security_key/security_key_ipc_constants.h

 // Copyright 2016 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 REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_IPC_CONSTANTS_H_
 #define REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_IPC_CONSTANTS_H_
 
 #include <string>
 
+#include "mojo/edk/embedder/named_platform_handle.h"
+
 namespace remoting {
 
 // Used to indicate an error during a security key forwarding session.
 extern const char kSecurityKeyConnectionError[];
 
 // Returns the name of the well-known IPC server channel used to initiate a
 // security key forwarding session.
-const std::string& GetSecurityKeyIpcChannelName();
+const mojo::edk::NamedPlatformHandle& GetSecurityKeyIpcChannel();
 
 // Sets the name of the well-known IPC server channel for testing purposes.
-void SetSecurityKeyIpcChannelNameForTest(const std::string& channel_name);
+void SetSecurityKeyIpcChannelForTest(
+    const mojo::edk::NamedPlatformHandle& channel_handle);
 
 // Returns a path appropriate for placing a channel name.  Without this path
 // prefix, we may not have permission on linux to bind(2) a socket to a name in
 // the current directory.
 std::string GetChannelNamePathPrefixForTest();
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SECURITY_KEY_SECURITY_KEY_IPC_CONSTANTS_H_