Store in memory cookies in a hash set instead of a list.

chrome/chrome_browser.gypi

 # 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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 207 matching lines @@
       'browser/browsing_data/browsing_data_local_storage_helper.cc',
       'browser/browsing_data/browsing_data_local_storage_helper.h',
       'browser/browsing_data/browsing_data_service_worker_helper.cc',
       'browser/browsing_data/browsing_data_service_worker_helper.h',
       'browser/browsing_data/browsing_data_quota_helper.cc',
       'browser/browsing_data/browsing_data_quota_helper.h',
       'browser/browsing_data/browsing_data_quota_helper_impl.cc',
       'browser/browsing_data/browsing_data_quota_helper_impl.h',
       'browser/browsing_data/browsing_data_remover.cc',
       'browser/browsing_data/browsing_data_remover.h',
+      'browser/browsing_data/canonical_cookie_hash.cc',
+      'browser/browsing_data/canonical_cookie_hash.h',
       'browser/browsing_data/cookies_tree_model.cc',
       'browser/browsing_data/cookies_tree_model.h',
       'browser/browsing_data/local_data_container.cc',
       'browser/browsing_data/local_data_container.h',
       'browser/character_encoding.cc',
       'browser/character_encoding.h',
       'browser/chrome_net_benchmarking_message_filter.cc',
       'browser/chrome_net_benchmarking_message_filter.h',
       'browser/chrome_browser_application_mac.h',
       'browser/chrome_browser_application_mac.mm',
@@ skipping 3390 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }