Remove NaCl support.

src/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 1724 matching lines @@
         'base/accounting-allocator.h',
         'base/adapters.h',
         'base/atomic-utils.h',
         'base/atomicops.h',
         'base/atomicops_internals_arm64_gcc.h',
         'base/atomicops_internals_arm_gcc.h',
         'base/atomicops_internals_atomicword_compat.h',
         'base/atomicops_internals_mac.h',
         'base/atomicops_internals_mips_gcc.h',
         'base/atomicops_internals_mips64_gcc.h',
-        'base/atomicops_internals_portable.h',
         'base/atomicops_internals_ppc_gcc.h',
         'base/atomicops_internals_s390_gcc.h',
         'base/atomicops_internals_tsan.h',
         'base/atomicops_internals_x86_gcc.cc',
         'base/atomicops_internals_x86_gcc.h',
         'base/atomicops_internals_x86_msvc.h',
         'base/bits.cc',
         'base/bits.h',
         'base/build_config.h',
         'base/compiler-specific.h',
@@ skipping 36 matching lines @@
         'base/utils/random-number-generator.cc',
         'base/utils/random-number-generator.h',
       ],
       'conditions': [
         ['want_separate_host_toolset==1', {
           'toolsets': ['host', 'target'],
         }, {
           'toolsets': ['target'],
         }],
         ['OS=="linux"', {
-            'conditions': [
-              ['nacl_target_arch=="none"', {
-                'link_settings': {
-                  'libraries': [
-                    '-ldl',
-                    '-lrt'
-                  ],
-                },
-              }, {
-                'defines': [
-                  'V8_LIBRT_NOT_AVAILABLE=1',
-                ],
-              }],
-            ],
+            'link_settings': {
+              'libraries': [
+                '-ldl',
+                '-lrt'
+              ],
+            },
             'sources': [
               'base/platform/platform-linux.cc',
               'base/platform/platform-posix.cc'
             ],
           }
         ],
         ['OS=="android"', {
             'sources': [
               'base/platform/platform-posix.cc'
             ],
@@ skipping 555 matching lines @@
       'conditions': [
         ['want_separate_host_toolset==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }