WebUI TaskManager: make it default on Chrome OS

chrome/chrome_tests.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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 2558 matching lines @@
         'browser/renderer_host/render_process_host_chrome_browsertest.cc',
         'browser/renderer_host/web_cache_manager_browsertest.cc',
         'browser/safe_browsing/safe_browsing_blocking_page_test.cc',
         'browser/safe_browsing/safe_browsing_service_browsertest.cc',
         'browser/service/service_process_control_browsertest.cc',
         'browser/sessions/session_restore_browsertest.cc',
         'browser/sessions/tab_restore_service_browsertest.cc',
         'browser/speech/speech_input_bubble_browsertest.cc',
         'browser/ssl/ssl_browser_tests.cc',
         'browser/task_manager/task_manager_browsertest.cc',
+        'browser/task_manager/task_manager_browsertest_util.h',
         'browser/task_manager/task_manager_notification_browsertest.cc',
         'browser/translate/translate_manager_browsertest.cc',
         'browser/ui/browser_init_browsertest.cc',
         'browser/ui/browser_navigator_browsertest.cc',
         'browser/ui/browser_navigator_browsertest.h',
         'browser/ui/browser_navigator_browsertest_chromeos.cc',
         'browser/ui/cocoa/view_id_util_browsertest.mm',
         'browser/ui/cocoa/applescript/browsercrapplication+applescript_test.mm',
         'browser/ui/cocoa/applescript/window_applescript_test.mm',
         'browser/ui/find_bar/find_bar_host_browsertest.cc',
@@ skipping 1769 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }