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

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

Index: chrome/browser/ui/gtk/download/download_item_gtk.cc
diff --git a/chrome/browser/ui/gtk/download/download_item_gtk.cc b/chrome/browser/ui/gtk/download/download_item_gtk.cc
index f4504a38a6935f5699f8b5d155df215b95173564..c8e80617d26f149983c1a8c718f1d2574199a022 100644
--- a/chrome/browser/ui/gtk/download/download_item_gtk.cc
+++ b/chrome/browser/ui/gtk/download/download_item_gtk.cc
@@ -327,9 +327,6 @@ void DownloadItemGtk::OnDownloadUpdated(DownloadItem* download) {
   }
 
   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());
@@ -373,6 +370,11 @@ void DownloadItemGtk::OnDownloadUpdated(DownloadItem* download) {
   UpdateStatusLabel(status_text_);
 }
 
+void DownloadItemGtk::OnDownloadDestructed(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());