Remove kDisableDownloadNotification and stop compiling shelf code on

chrome/browser/ui/chrome_pages.cc

 // 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/chrome_pages.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 142 matching lines @@
 void ShowHistory(Browser* browser) {
   content::RecordAction(UserMetricsAction("ShowHistory"));
   NavigateParams params(
       GetSingletonTabNavigateParams(browser, GURL(kChromeUIHistoryURL)));
   params.path_behavior = NavigateParams::IGNORE_AND_NAVIGATE;
   ShowSingletonTabOverwritingNTP(browser, params);
 }
 
 void ShowDownloads(Browser* browser) {
   content::RecordAction(UserMetricsAction("ShowDownloads"));
+#if !defined(OS_CHROMEOS)
   if (browser->window() && browser->window()->IsDownloadShelfVisible())
     browser->window()->GetDownloadShelf()->Close(DownloadShelf::USER_ACTION);
-
+#endif
   ShowSingletonTabOverwritingNTP(
       browser,
       GetSingletonTabNavigateParams(browser, GURL(kChromeUIDownloadsURL)));
 }
 
 void ShowExtensions(Browser* browser,
                     const std::string& extension_to_highlight) {
   content::RecordAction(UserMetricsAction("ShowExtensions"));
   NavigateParams params(
       GetSingletonTabNavigateParams(browser, GURL(kChromeUIExtensionsURL)));
@@ skipping 228 matching lines @@
       SigninManagerFactory::GetForProfile(original_profile);
   DCHECK(manager->IsSigninAllowed());
   if (manager->IsAuthenticated())
     ShowSettings(browser);
   else
     ShowBrowserSignin(browser, access_point);
 }
 #endif
 
 }  // namespace chrome