Revert of NaCl cleanup: Split out irt_interfaces.cc from irt_ppapi.cc

ppapi/nacl_irt/irt_interfaces.h

Index: ppapi/nacl_irt/irt_interfaces.h
diff --git a/ppapi/nacl_irt/irt_interfaces.h b/ppapi/nacl_irt/irt_interfaces.h
deleted file mode 100644
index 0971900d8316a61bbb4e17da84e70f9f13900e4f..0000000000000000000000000000000000000000
--- a/ppapi/nacl_irt/irt_interfaces.h
+++ /dev/null
@@ -1,15 +0,0 @@
-// 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.
-
-#ifndef PPAPI_NACL_IRT_IRT_INTERFACES_H_
-#define PPAPI_NACL_IRT_IRT_INTERFACES_H_
-
-#include <stdlib.h>
-
-extern const struct nacl_irt_ppapihook nacl_irt_ppapihook;
-
-size_t chrome_irt_query(const char* interface_ident,
-                        void* table, size_t tablesize);
-
-#endif  // PPAPI_NACL_IRT_IRT_INTERFACES_H_