Don't create DL shelf on CrOS when showing chrome://downloads

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 140 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 (browser->window()) {
-    DownloadShelf* shelf = browser->window()->GetDownloadShelf();
-    // The downloads page is always shown in response to a user action.
-    if (shelf->IsShowing())
-      shelf->Close(DownloadShelf::USER_ACTION);
-  }
+  if (browser->window() && browser->window()->IsDownloadShelfVisible())
+    browser->window()->GetDownloadShelf()->Close(DownloadShelf::USER_ACTION);
+
   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 225 matching lines @@
       SigninManagerFactory::GetForProfile(original_profile);
   DCHECK(manager->IsSigninAllowed());
   if (manager->IsAuthenticated())
     ShowSettings(browser);
   else
     ShowBrowserSignin(browser, access_point);
 }
 #endif
 
 }  // namespace chrome