Make DownloadHistory observe manager, items

net/base/net_log_event_type_list.h

 // 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.
 
 // NOTE: No header guards are used, since this file is intended to be expanded
 // directly into net_log.h. DO NOT include this file anywhere else.
 
 // In the event of a failure, a many end events will have a |net_error|
 // parameter with the integer error code associated with the failure.  Most
 // of these parameters are not individually documented.
@@ skipping 1542 matching lines @@
 //                   For other downloads, uses the first non-empty variable of:
 //                     |state_info.force_filename|
 //                     |suggested_filename_|
 //                     the filename specified in the final URL>,
 //     "danger_type": <NOT,FILE,URL,CONTENT,MAYBE_CONTENT>,
 //     "safety_state": <SAFE, DANGEROUS, DANGEROUS_BUT_VALIDATED>,
 //     "start_offset": <Where to start writing (defaults to 0)>,
 //   }
 // The END event will occur when the download is interrupted, canceled or
 // completed.
+// DownloadItems that are loaded from history and are never active simply ADD
+// one of these events.
 EVENT_TYPE(DOWNLOAD_ITEM_ACTIVE)
 
 // This event is created when a download item has been checked by the
 // safe browsing system.
 //   {
 //     "danger_type": <NOT,FILE,URL,CONTENT,MAYBE_CONTENT>,
 //     "safety_state": <SAFE, DANGEROUS, DANGEROUS_BUT_VALIDATED>,
 //   }
 EVENT_TYPE(DOWNLOAD_ITEM_SAFETY_STATE_UPDATED)
 
-// This event is created when a download item has been inserted into the
-// history database.
-//   {
-//     "db_handle": <The database handle for the item>,
-//   }
-EVENT_TYPE(DOWNLOAD_ITEM_IN_HISTORY)
-
 // This event is created when a download item is updated.
 //   {
 //     "bytes_so_far": <Number of bytes received>,
 //     "hash_state": <Current hash state, as a hex-encoded binary string>,
 //   }
 EVENT_TYPE(DOWNLOAD_ITEM_UPDATED)
 
 // This event is created when a download item is renamed.
 //   {
 //     "old_filename": <Old file name>,
@@ skipping 166 matching lines @@
 //   }
 EVENT_TYPE(FTP_DATA_CONNECTION)
 
 // This event is created when FTP control connection response is processed.
 // It contains following parameters:
 //   {
 //     "lines": <list of strings - each representing a line of the response>
 //     "status_code": <numeric status code of the response>
 //   }
 EVENT_TYPE(FTP_CONTROL_RESPONSE)