Make startup_tests build and run on Linux (except reference tests).

chrome/chrome.gyp

 # Copyright (c) 2009 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': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 345 matching lines @@
         'browser/automation/automation_resource_tracker.cc',
         'browser/automation/automation_resource_tracker.h',
         'browser/automation/automation_tab_tracker.h',
         'browser/automation/automation_window_tracker.h',
         'browser/automation/ui_controls.cc',
         'browser/automation/ui_controls.h',
         'browser/automation/url_request_failed_dns_job.cc',
         'browser/automation/url_request_failed_dns_job.h',
         'browser/automation/url_request_slow_download_job.cc',
         'browser/automation/url_request_slow_download_job.h',
+        'browser/automation/url_request_mock_http_job.cc',
+        'browser/automation/url_request_mock_http_job.h',
         'browser/bookmarks/bookmark_codec.cc',
         'browser/bookmarks/bookmark_codec.h',
         'browser/bookmarks/bookmark_context_menu.cc',
         'browser/bookmarks/bookmark_context_menu.h',
         'browser/bookmarks/bookmark_drag_data.cc',
         'browser/bookmarks/bookmark_drag_data.h',
         'browser/bookmarks/bookmark_drop_info.cc',
         'browser/bookmarks/bookmark_drop_info.h',
         'browser/bookmarks/bookmark_folder_tree_model.cc',
         'browser/bookmarks/bookmark_folder_tree_model.h',
@@ skipping 1398 matching lines @@
               'outputs': [],
               'action_name': 'package_chrome',
               'action': ['tools/mac/package_chrome.sh' ],
             },
           ],  # 'actions'
         },
       ]},  # 'targets'
     ],  # OS=="mac"
   ],  # 'conditions'
 }