Reland DownloadManager::GetAllDownloads actually does now

chrome/browser/download/download_status_updater_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/download/download_status_updater.h"
 
 #include "base/mac/foundation_util.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/supports_user_data.h"
 #include "base/sys_string_conversions.h"
@@ skipping 246 matching lines @@
 void DownloadStatusUpdater::UpdateAppIconDownloadProgress(
     content::DownloadItem* download) {
 
   // Always update overall progress.
 
   float progress = 0;
   int download_count = 0;
   bool progress_known = GetProgress(&progress, &download_count);
   UpdateAppIcon(download_count, progress_known, progress);
 
+  if (download->GetFullPath().empty())
+    return;
+
   // Update NSProgress-based indicators.
 
   if (NSProgressSupported()) {
     CrNSProgressUserData* progress_data = static_cast<CrNSProgressUserData*>(
         download->GetUserData(&kCrNSProgressUserDataKey));
     if (!progress_data)
       CreateNSProgress(download);
     else if (download->GetState() != content::DownloadItem::IN_PROGRESS)
       DestroyNSProgress(download, progress_data);
     else
@@ skipping 12 matching lines @@
     }
 
     // Notify the Finder.
     NSString* parent_path = [download_path stringByDeletingLastPathComponent];
     FNNotifyByPath(
         reinterpret_cast<const UInt8*>([parent_path fileSystemRepresentation]),
         kFNDirectoryModifiedMessage,
         kNilOptions);
   }
 }