Detect removed files and reflect the state in chrome://downloads and the download shelf

chrome/browser/download/download_item.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/download/download_item.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/format_macros.h"
 #include "base/i18n/case_conversion.h"
@@ skipping 114 matching lines @@
       original_mime_type_(info.original_mime_type),
       total_bytes_(info.total_bytes),
       received_bytes_(info.received_bytes),
       start_tick_(base::TimeTicks()),
       state_(static_cast<DownloadState>(info.state)),
       start_time_(info.start_time),
       db_handle_(info.db_handle),
       download_manager_(download_manager),
       is_paused_(false),
       open_when_complete_(false),
+      file_exists_(true),
       safety_state_(SAFE),
       danger_type_(NOT_DANGEROUS),
       auto_opened_(false),
       target_name_(info.original_name),
       render_process_id_(-1),
       request_id_(-1),
       save_as_(false),
       is_otr_(false),
       is_extension_install_(info.is_extension_install),
       is_temporary_(false),
@@ skipping 20 matching lines @@
       total_bytes_(info.total_bytes),
       received_bytes_(0),
       last_os_error_(0),
       start_tick_(base::TimeTicks::Now()),
       state_(IN_PROGRESS),
       start_time_(info.start_time),
       db_handle_(DownloadHistory::kUninitializedHandle),
       download_manager_(download_manager),
       is_paused_(false),
       open_when_complete_(false),
+      file_exists_(true),
       safety_state_(GetSafetyState(info.is_dangerous_file,
                                    info.is_dangerous_url)),
       danger_type_(GetDangerType(info.is_dangerous_file,
                                  info.is_dangerous_url)),
       auto_opened_(false),
       target_name_(info.original_name),
       render_process_id_(info.child_id),
       request_id_(info.request_id),
       save_as_(info.prompt_user_for_save_location),
       is_otr_(is_otr),
@@ skipping 19 matching lines @@
       total_bytes_(0),
       received_bytes_(0),
       last_os_error_(0),
       start_tick_(base::TimeTicks::Now()),
       state_(IN_PROGRESS),
       start_time_(base::Time::Now()),
       db_handle_(DownloadHistory::kUninitializedHandle),
       download_manager_(download_manager),
       is_paused_(false),
       open_when_complete_(false),
+      file_exists_(true),
       safety_state_(SAFE),
       danger_type_(NOT_DANGEROUS),
       auto_opened_(false),
       render_process_id_(-1),
       request_id_(-1),
       save_as_(false),
       is_otr_(is_otr),
       is_extension_install_(false),
       is_temporary_(false),
       all_data_saved_(false),
       opened_(false) {
   Init(true /* start progress timer */);
 }
 
 DownloadItem::~DownloadItem() {
   state_ = REMOVING;
   UpdateObservers();
 }
 
 void DownloadItem::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
+bool DownloadItem::HasObserver(Observer* observer) {
+  return observers_.HasObserver(observer);
+}
+
 void DownloadItem::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void DownloadItem::UpdateObservers() {
   FOR_EACH_OBSERVER(Observer, observers_, OnDownloadUpdated(this));
 }
 
 bool DownloadItem::CanOpenDownload() {
   return !Extension::IsExtension(target_name_);
@@ skipping 406 matching lines @@
         target_name_.value().c_str(),
         full_path().value().c_str());
   } else {
     description += base::StringPrintf(" url = \"%s\"", url().spec().c_str());
   }
 
   description += " }";
 
   return description;
 }