Add quarantine metadata to downloads on the Mac.

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 236 matching lines @@
         'common/pref_member.cc',
         'common/pref_member.h',
         'common/pref_names.cc',
         'common/pref_names.h',
         'common/pref_service.cc',
         'common/pref_service.h',
         'common/process_watcher.cc',
         'common/process_watcher.h',
         'common/property_bag.cc',
         'common/property_bag.h',
+        'common/quarantine_mac.h',
+        'common/quarantine_mac.mm',
         'common/ref_counted_util.h',
         'common/render_messages.h',
         'common/render_messages_internal.h',
         'common/resource_bundle.cc',
         'common/resource_bundle.h',
         'common/resource_bundle_linux.cc',
         'common/resource_bundle_mac.mm',
         'common/resource_bundle_win.cc',
         'common/resource_dispatcher.cc',
         'common/resource_dispatcher.h',
@@ skipping 2686 matching lines @@
                           '../tools/code_coverage/coverage_posix.py',
                           '--directory',
                           '<(PRODUCT_DIR)' ],
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }