Remove NaCl support.

include/v8config.h

 // Copyright 2013 the V8 project 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 V8CONFIG_H_
 #define V8CONFIG_H_
 
 // clang-format off
 
 // Platform headers for feature detection below.
@@ skipping 45 matching lines @@
 // -----------------------------------------------------------------------------
 // Operating system detection
 //
 //  V8_OS_ANDROID       - Android
 //  V8_OS_BSD           - BSDish (Mac OS X, Net/Free/Open/DragonFlyBSD)
 //  V8_OS_CYGWIN        - Cygwin
 //  V8_OS_DRAGONFLYBSD  - DragonFlyBSD
 //  V8_OS_FREEBSD       - FreeBSD
 //  V8_OS_LINUX         - Linux
 //  V8_OS_MACOSX        - Mac OS X
-//  V8_OS_NACL          - Native Client
 //  V8_OS_NETBSD        - NetBSD
 //  V8_OS_OPENBSD       - OpenBSD
 //  V8_OS_POSIX         - POSIX compatible (mostly everything except Windows)
 //  V8_OS_QNX           - QNX Neutrino
 //  V8_OS_SOLARIS       - Sun Solaris and OpenSolaris
 //  V8_OS_AIX           - AIX
 //  V8_OS_WIN           - Microsoft Windows
 
 #if defined(__ANDROID__)
 # define V8_OS_ANDROID 1
 # define V8_OS_LINUX 1
 # define V8_OS_POSIX 1
 #elif defined(__APPLE__)
 # define V8_OS_BSD 1
 # define V8_OS_MACOSX 1
 # define V8_OS_POSIX 1
-#elif defined(__native_client__)
-# define V8_OS_NACL 1
-# define V8_OS_POSIX 1
 #elif defined(__CYGWIN__)
 # define V8_OS_CYGWIN 1
 # define V8_OS_POSIX 1
 #elif defined(__linux__)
 # define V8_OS_LINUX 1
 # define V8_OS_POSIX 1
 #elif defined(__sun)
 # define V8_OS_POSIX 1
 # define V8_OS_SOLARIS 1
 #elif defined(_AIX)
@@ skipping 327 matching lines @@
 //   int foo() WARN_UNUSED_RESULT;
 #if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT
 #define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define V8_WARN_UNUSED_RESULT /* NOT SUPPORTED */
 #endif
 
 // clang-format on
 
 #endif  // V8CONFIG_H_