Move session_id.{cc,h} from chrome/browser/sessions to components/sessions

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 1156 matching lines @@
       'browser/services/gcm/push_messaging_permission_context.cc',
       'browser/services/gcm/push_messaging_permission_context.h',
       'browser/services/gcm/push_messaging_permission_context_factory.cc',
       'browser/services/gcm/push_messaging_permission_context_factory.h',
       'browser/services/gcm/push_messaging_service_impl.cc',
       'browser/services/gcm/push_messaging_service_impl.h',
       'browser/sessions/base_session_service.cc',
       'browser/sessions/base_session_service.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_android.cc',
       'browser/sessions/session_tab_helper.cc',
       'browser/sessions/session_tab_helper.h',
       'browser/sessions/session_types.cc',
       'browser/sessions/session_types.h',
       'browser/sessions/tab_restore_service.cc',
       'browser/sessions/tab_restore_service.h',
       'browser/sessions/tab_restore_service_factory.cc',
       'browser/sessions/tab_restore_service_factory.h',
       'browser/sessions/tab_restore_service_helper.cc',
@@ skipping 2445 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }