Reland DownloadItem::Observer::OnDownloadDestroyed() replaces DownloadItem::REMOVING

chrome/browser/ui/gtk/download/download_item_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/gtk/download/download_item_gtk.h"
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/debug/trace_event.h"
 #include "base/metrics/histogram.h"
@@ skipping 309 matching lines @@
   if (download->GetUserVerifiedFilePath() != icon_filepath_) {
     // Turns out the file path is "Unconfirmed %d.crdownload" for dangerous
     // downloads. When the download is confirmed, the file is renamed on
     // another thread, so reload the icon if the download filename changes.
     LoadIcon();
 
     UpdateTooltip();
   }
 
   switch (download->GetState()) {
-    case DownloadItem::REMOVING:
-      parent_shelf_->RemoveDownloadItem(this);  // This will delete us!
-      return;
     case DownloadItem::CANCELLED:
       StopDownloadProgress();
       gtk_widget_queue_draw(progress_area_.get());
       break;
     case DownloadItem::INTERRUPTED:
       StopDownloadProgress();
       UpdateTooltip();
 
       complete_animation_.Show();
       break;
@@ skipping 23 matching lines @@
           StopDownloadProgress() : StartDownloadProgress();
       break;
     default:
       NOTREACHED();
   }
 
   status_text_ = UTF16ToUTF8(download_model_->GetStatusText());
   UpdateStatusLabel(status_text_);
 }
 
+void DownloadItemGtk::OnDownloadDestroyed(DownloadItem* download) {
+  parent_shelf_->RemoveDownloadItem(this);
+  // This will delete us!
+}
+
 void DownloadItemGtk::AnimationProgressed(const ui::Animation* animation) {
   if (animation == &complete_animation_) {
     gtk_widget_queue_draw(progress_area_.get());
   } else {
     DCHECK(animation == new_item_animation_.get());
     if (download_model_->IsDangerous()) {
       int progress = static_cast<int>((dangerous_hbox_full_width_ -
                                        dangerous_hbox_start_width_) *
                                       animation->GetCurrentValue());
       int showing_width = dangerous_hbox_start_width_ + progress;
@@ skipping 535 matching lines @@
   get_download()->DangerousDownloadValidated();
 }
 
 void DownloadItemGtk::OnDangerousDecline(GtkWidget* button) {
   UMA_HISTOGRAM_LONG_TIMES("clickjacking.discard_download",
                            base::Time::Now() - creation_time_);
   if (get_download()->IsPartialDownload())
     get_download()->Cancel(true);
   get_download()->Delete(DownloadItem::DELETE_DUE_TO_USER_DISCARD);
 }