Clear session-only data when all browser windows are closed.

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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1957 matching lines @@
         'browser/service/service_process_control_mac.mm',
         'browser/service/service_process_control.h',
         'browser/sessions/base_session_service.cc',
         'browser/sessions/base_session_service.h',
         'browser/sessions/persistent_tab_restore_service.cc',
         'browser/sessions/persistent_tab_restore_service.h',
         'browser/sessions/session_backend.cc',
         'browser/sessions/session_backend.h',
         'browser/sessions/session_command.cc',
         'browser/sessions/session_command.h',
+        'browser/sessions/session_data_deleter.cc',
+        'browser/sessions/session_data_deleter.h',
         'browser/sessions/session_id.cc',
         'browser/sessions/session_id.h',
         'browser/sessions/session_restore.cc',
         'browser/sessions/session_restore.h',
         'browser/sessions/session_restore_android.cc',
         'browser/sessions/session_service.cc',
         'browser/sessions/session_service.h',
         'browser/sessions/session_service_factory.cc',
         'browser/sessions/session_service_factory.h',
         'browser/sessions/session_tab_helper.cc',
@@ skipping 1708 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }