Added download error descriptions to tooltips for Mac & Linux.

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

 // 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/cocoa/download/download_item_mac.h"
 
 #include "base/callback.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_item_model.h"
 #import "chrome/browser/ui/cocoa/download/download_item_controller.h"
@@ skipping 39 matching lines @@
       [item_controller_ remove];  // We're deleted now!
       break;
     case DownloadItem::COMPLETE:
       if (download->GetAutoOpened()) {
         [item_controller_ remove];  // We're deleted now!
         return;
       }
       download_util::NotifySystemOfDownloadComplete(download->GetFullPath());
       // fall through
     case DownloadItem::IN_PROGRESS:
+    case DownloadItem::CANCELLED:
+      [item_controller_ setStateFromDownload:download_model_.get()];
+      break;
     case DownloadItem::INTERRUPTED:
-    case DownloadItem::CANCELLED:
+      [item_controller_ updateToolTip];
       [item_controller_ setStateFromDownload:download_model_.get()];
       break;
     default:
       NOTREACHED();
   }
 }
 
 void DownloadItemMac::OnDownloadOpened(content::DownloadItem* download) {
   DCHECK_EQ(download, download_model_->download());
   [item_controller_ downloadWasOpened];
@@ skipping 19 matching lines @@
                          base::Bind(&DownloadItemMac::OnExtractIconComplete,
                                     base::Unretained(this)));
 }
 
 void DownloadItemMac::OnExtractIconComplete(IconManager::Handle handle,
                                             gfx::Image* icon) {
   if (!icon)
     return;
   [item_controller_ setIcon:*icon];
 }