Only include chromevox_test_data in isolated swarming tests for chromeos builds.

chrome/browser_tests.isolate

 # Copyright (c) 2012 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.
 {
   'includes': [
     'chrome.isolate',
   ],
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'command': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)',
           '<(PRODUCT_DIR)/browser_tests<(EXECUTABLE_SUFFIX)',
           '--test-launcher-bot-mode',
         ],
         'isolate_dependency_tracked': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)/libclearkeycdm.so',
           '<(PRODUCT_DIR)/libclearkeycdmadapter.so',
           '<(PRODUCT_DIR)/libppapi_tests.so',
           '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
         ],
-        'isolate_dependency_untracked': [
-          '<(PRODUCT_DIR)/chromevox_test_data/',
-        ],
       },
     }],
     ['OS=="linux" or OS=="mac"', {
       'variables': {
         'isolate_dependency_tracked': [
           'browser/nacl_host/test/debug_stub_browser_tests.py',
           'browser/nacl_host/test/gdb_rsp.py',
         ],
       },
     }],
@@ skipping 97 matching lines @@
           '<(PRODUCT_DIR)/ppapi_tests.dll',
           '<(PRODUCT_DIR)/security_tests.dll',
           'tools/build/repack_locales.py',
         ],
         'isolate_dependency_untracked': [
           '../third_party/npapi/npspy/extern/plugin/',
           '../third_party/psyco_win32/psyco/',
         ],
       },
     }],
+    ['chromeos==1', {
+      'variables': {
+        'isolate_dependency_untracked': [
+          '<(PRODUCT_DIR)/chromevox_test_data/',
+        ],
+      },
+    }],
   ],
 }