Removed unused mojo_nacl code and GYP targets.

mojo/nacl/monacl_sel_main.h

Index: mojo/nacl/monacl_sel_main.h
diff --git a/mojo/nacl/monacl_sel_main.h b/mojo/nacl/monacl_sel_main.h
deleted file mode 100644
index f543d1631af0ceaeeb3ca30e2a1ee9c6fc1994db..0000000000000000000000000000000000000000
--- a/mojo/nacl/monacl_sel_main.h
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2014 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 MOJO_NACL_MONACL_SEL_MAIN_H_
-#define MOJO_NACL_MONACL_SEL_MAIN_H_
-
-namespace mojo {
-
-void LaunchNaCl(const char* nexe_file, const char* irt_file,
-                int app_argc, char* app_argv[]);
-
-} // namespace mojo
-
-#endif // MOJO_NACL_MONACL_SEL_MAIN_H_