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

ppapi/nacl_irt/irt_pnacl_translator_compile.cc

Index: ppapi/nacl_irt/irt_pnacl_translator_compile.cc
diff --git a/ppapi/nacl_irt/irt_pnacl_translator_compile.cc b/ppapi/nacl_irt/irt_pnacl_translator_compile.cc
index a79dd959277272311c9f0f83a15d78b007096d12..5a339f154556cd2a5617cbefe0b72c9a4b233618 100644
--- a/ppapi/nacl_irt/irt_pnacl_translator_compile.cc
+++ b/ppapi/nacl_irt/irt_pnacl_translator_compile.cc
@@ -100,9 +100,7 @@ class TranslatorCompileListener : public IPC::Listener {
 
 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();
 }