Make DownloadHistory observe manager, items

chrome/chrome_browser.gypi

 # Copyright (c) 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',
@@ skipping 726 matching lines @@
         'browser/history/android/sqlite_cursor.cc',
         'browser/history/android/sqlite_cursor.h',
         'browser/history/android/urls_sql_handler.cc',
         'browser/history/android/urls_sql_handler.h',
         'browser/history/android/visit_sql_handler.cc',
         'browser/history/android/visit_sql_handler.h',
         'browser/history/archived_database.cc',
         'browser/history/archived_database.h',
         'browser/history/download_database.cc',
         'browser/history/download_database.h',
+        'browser/history/download_row.cc',
+        'browser/history/download_row.h',
         'browser/history/expire_history_backend.cc',
         'browser/history/expire_history_backend.h',
         'browser/history/history.cc',
         'browser/history/history.h',
         'browser/history/history_backend.cc',
         'browser/history/history_backend.h',
         'browser/history/history_backend_android.cc',
         'browser/history/history_database.cc',
         'browser/history/history_database.h',
         'browser/history/history_marshaling.h',
@@ skipping 2289 matching lines @@
             'proto_in_dir': '../third_party/cros_system_api/dbus',
             'proto_out_dir': 'chrome/browser/media_transfer_protocol',
           },
           'includes': ['../build/protoc.gypi'],
         },
       ],
      },
     ],
   ],
 }