Pass around IPC::ChannelHandles instead of raw fds in the NaCl IRT.

ppapi/nacl_irt/irt_pnacl_translator_compile.cc

 // Copyright 2015 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.
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sync_channel.h"
 #include "native_client/src/untrusted/irt/irt_dev.h"
 #include "ppapi/nacl_irt/irt_interfaces.h"
@@ skipping 82 matching lines @@
   }
 
   std::unique_ptr<IPC::Channel> channel_;
   const struct nacl_irt_pnacl_compile_funcs* funcs_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslatorCompileListener);
 };
 
 void ServeTranslateRequest(const struct nacl_irt_pnacl_compile_funcs* funcs) {
   base::MessageLoop loop;
-  int fd = ppapi::GetRendererIPCFileDescriptor();
-  IPC::ChannelHandle handle("NaCl IPC", base::FileDescriptor(fd, false));
-  new TranslatorCompileListener(handle, funcs);
+  new TranslatorCompileListener(ppapi::GetRendererIPCChannelHandle(), funcs);
   loop.Run();
 }
 
 }
 
 const struct nacl_irt_private_pnacl_translator_compile
     nacl_irt_private_pnacl_translator_compile = {
   ServeTranslateRequest
 };
 
 #endif  // !defined(OS_NACL_NONSFI)