Revert of Convert NaCl renderer-loader messages to mojo.

components/nacl/common/nacl.mojom

-// 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.
-
-module nacl.mojom;
-
-[Native]
-enum NaClErrorCode;
-
-interface NaClRendererHost {
-  // This message must be synchronous to ensure that the exit status is sent
-  // from NaCl to the renderer before the NaCl process exits very soon after.
-  [Sync]
-  ReportExitStatus(int32 exit_status) => ();
-
-  // This message must be synchronous to ensure that the load status is sent
-  // from NaCl to the renderer before the NaCl process exits very soon after.
-  [Sync]
-  ReportLoadStatus(NaClErrorCode load_status) => ();
-
-  ProvideExitControl(NaClExitControl exit_control);
-};
-
-// When this interface is closed, it indicates that the NaCl loader process
-// should exit.
-interface NaClExitControl {};