Revert 149794 - DownloadItem::Observer::OnDownloadDestroyed() replaces DownloadItem::REMOVING

chrome/browser/ui/cocoa/download/download_item_mac.mm

Index: chrome/browser/ui/cocoa/download/download_item_mac.mm
===================================================================
--- chrome/browser/ui/cocoa/download/download_item_mac.mm	(revision 150095)
+++ chrome/browser/ui/cocoa/download/download_item_mac.mm	(working copy)
@@ -46,6 +46,9 @@
   }
 
   switch (download->GetState()) {
+    case DownloadItem::REMOVING:
+      [item_controller_ remove];  // We're deleted now!
+      break;
     case DownloadItem::COMPLETE:
       if (download->GetAutoOpened()) {
         [item_controller_ remove];  // We're deleted now!
@@ -66,10 +69,6 @@
   }
 }
 
-void DownloadItemMac::OnDownloadDestroyed(content::DownloadItem* download) {
-  [item_controller_ remove];  // We're deleted now!
-}
-
 void DownloadItemMac::OnDownloadOpened(content::DownloadItem* download) {
   DCHECK_EQ(download, download_model_->download());
   [item_controller_ downloadWasOpened];