Add an option to disable NaCl at compile time for platforms where it doesn't build yet

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
@@ skipping 2980 matching lines @@
           ],
         },],
       ],
     },
     {
       'target_name': 'renderer',
       'type': '<(library)',
       'msvs_guid': '9301A569-5D2B-4D11-9332-B1E30AEACB8D',
       'dependencies': [
         'common',
-        'nacl',
         'plugin',
         'chrome_resources',
         'chrome_strings',
         '../printing/printing.gyp:printing',
         '../skia/skia.gyp:skia',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/npapi/npapi.gyp:npapi',
         '../webkit/webkit.gyp:glue',
         '../webkit/webkit.gyp:webkit',
@@ skipping 95 matching lines @@
         'renderer/webplugin_delegate_proxy.h',
         'renderer/webworker_proxy.cc',
         'renderer/webworker_proxy.h',
       ],
       'link_settings': {
         'mac_bundle_resources': [
           'renderer/renderer.sb',
         ],
       },
       'conditions': [
+        ['disable_nacl!=1', {
+          'dependencies': [
+            'nacl',
+          ],
+        }],
         # Linux-specific rules.
         ['OS=="linux"', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
         # Windows-specific rules.
         ['OS=="win"', {
           'include_dirs': [
@@ skipping 3656 matching lines @@
               'defines': [
                 'POSIX',
               ],
             }],
           ],
         },
       ],  # targets when chrome_personalization==1
     }],
   ],  # 'conditions'
 }