Use chain-loading for Linux nacl_helper

chrome/chrome_installer.gypi

 # Copyright (c) 2011 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': {
     'lastchange_path': '<(SHARED_INTERMEDIATE_DIR)/build/LASTCHANGE',
     # 'branding_dir' is set in the 'conditions' section at the bottom.
   },
   'conditions': [
@@ skipping 392 matching lines @@
           # TODO(mmoss) Any convenient way to get all the relevant build
           # files? (e.g. all locales, resources, etc.)
           '<(PRODUCT_DIR)/chrome',
           '<(PRODUCT_DIR)/chrome.pak',
           '<(PRODUCT_DIR)/chrome_sandbox',
           '<(PRODUCT_DIR)/libffmpegsumo.so',
           '<(PRODUCT_DIR)/libppGoogleNaClPluginChrome.so',
           '<(PRODUCT_DIR)/xdg-mime',
           '<(PRODUCT_DIR)/xdg-settings',
           '<(PRODUCT_DIR)/locales/en-US.pak',
-          '<(PRODUCT_DIR)/nacl_helper.so',
+          '<(PRODUCT_DIR)/nacl_helper',
           '<(PRODUCT_DIR)/nacl_helper_bootstrap',
         ],
         'flock_bash': ['flock', '--', '/tmp/linux_package_lock', 'bash'],
         'deb_build': '<(PRODUCT_DIR)/installer/debian/build.sh',
         'rpm_build': '<(PRODUCT_DIR)/installer/rpm/build.sh',
         'deb_cmd': ['<@(flock_bash)', '<(deb_build)', '-o' '<(PRODUCT_DIR)',
                     '-b', '<(PRODUCT_DIR)', '-a', '<(target_arch)'],
         'rpm_cmd': ['<@(flock_bash)', '<(rpm_build)', '-o' '<(PRODUCT_DIR)',
                     '-b', '<(PRODUCT_DIR)', '-a', '<(target_arch)'],
         'conditions': [
@@ skipping 493 matching lines @@
       'variables': {
          'branding_dir': 'app/theme/google_chrome',
       },
     }, { # else branding!="Chrome"
       'variables': {
          'branding_dir': 'app/theme/chromium',
       },
     }],
   ],
 }