Do not show downloads panel for temporary downloads.

chrome/browser/download/download_browsertest.cc

 // Copyright (c) 2011 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 "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
@@ skipping 1714 matching lines @@
   DownloadTestObserver* observer(CreateWaiter(browser(), 1));
   DownloadManagerForBrowser(browser())->DownloadUrlToFile(
       url, GURL(""), "", save_info, tab_contents);
   observer->WaitForFinished();
 
   // Check state.
   EXPECT_EQ(1, browser()->tab_count());
   ASSERT_TRUE(CheckDownloadFullPaths(browser(),
                                      target_file_full_path,
                                      OriginFile(file)));
-#if !defined(OS_CHROMEOS)
-  // TODO(rdsmith/achuith): Re-enable on ChromeOS when
-  // http://crbug.com/106856 is fixed.
 
   // Temporary downloads won't be visible.
   CheckDownloadUI(browser(), false, false, file);
-#endif
 }