Add a wrapper script which modifies the .isolate on the fly.

chrome/sync_integration_tests.isolate

 # Copyright 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.
 {
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'command': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)',
@@ skipping 27 matching lines @@
         'isolate_dependency_untracked': [
           '../third_party/pyftpdlib/',
           '../third_party/pywebsocket/',
           '../third_party/tlslite/',
         ],
       },
     }],
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'isolate_dependency_untracked': [
-          '../tools/swarming_client/',
           '<(PRODUCT_DIR)/pyproto/',
         ],
       },
     }],
     ['OS=="mac"', {
       'variables': {
         'command': [
           '<(PRODUCT_DIR)/sync_integration_tests<(EXECUTABLE_SUFFIX)',
           '--test-launcher-bot-mode',
         ],
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/ffmpegsumo.so',
         ],
         'isolate_dependency_untracked': [
           '<(PRODUCT_DIR)/<(mac_product_name) Framework.framework/',
           '<(PRODUCT_DIR)/<(mac_product_name).app/',
         ],
       },
     }],
   ],
 }