Revert r240867 "Remove untracked dependency "lib32" from browser_tests.isolate"

chrome/chrome.isolate

 # Copyright (c) 2013 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.
 {
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/libclearkeycdm.so',
           '<(PRODUCT_DIR)/libclearkeycdmadapter.so',
@@ skipping 12 matching lines @@
         ],
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/chrome<(EXECUTABLE_SUFFIX)',
           '<(PRODUCT_DIR)/chrome_100_percent.pak',
           '<(PRODUCT_DIR)/locales/en-US.pak',
           '<(PRODUCT_DIR)/locales/fr.pak',
           '<(PRODUCT_DIR)/nacl_irt_x86_64.nexe',
           '<(PRODUCT_DIR)/resources.pak',
         ],
         'isolate_dependency_untracked': [
+          '<(PRODUCT_DIR)/lib64/',
           '<(PRODUCT_DIR)/plugins/',
           '<(PRODUCT_DIR)/resources/extension/',
         ],
       },
     }],
     ['OS=="mac"', {
       'variables': {
         'command': [
           '<(PRODUCT_DIR)/<(mac_product_name).app/Contents/MacOS/<(mac_product_name)',
         ],
@@ skipping 16 matching lines @@
           '<(PRODUCT_DIR)/libEGL.dll',
           '<(PRODUCT_DIR)/libGLESv2.dll',
           '<(PRODUCT_DIR)/nacl64<(EXECUTABLE_SUFFIX)',
           '<(PRODUCT_DIR)/osmesa.dll',
           '<(PRODUCT_DIR)/ppGoogleNaClPluginChrome.dll',
         ],
       },
     }],
   ],
 }