Disable material design downloads UI from some tests.

chrome/browser/lifetime/browser_close_manager_browsertest.cc

 // Copyright 2013 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 <vector>
 
 #include "base/command_line.h"
 #include "base/files/scoped_temp_dir.h"
 #include "chrome/browser/background/background_mode_manager.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 686 matching lines @@
   public BrowserCloseManagerBrowserTest {
  public:
   BrowserCloseManagerWithDownloadsBrowserTest() {}
   virtual ~BrowserCloseManagerWithDownloadsBrowserTest() {}
 
   void SetUpOnMainThread() override {
     BrowserCloseManagerBrowserTest::SetUpOnMainThread();
     ASSERT_TRUE(scoped_download_directory_.CreateUniqueTempDir());
   }
 
+  // Disable new downloads UI as it is very very slow. https://crbug.com/526577
+  // TODO(dbeam): remove this once the downloads UI is not slow.
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    BrowserCloseManagerBrowserTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitch(switches::kDisableMaterialDesignDownloads);
+  }
+
   void SetDownloadPathForProfile(Profile* profile) {
     DownloadPrefs* download_prefs = DownloadPrefs::FromBrowserContext(profile);
     download_prefs->SetDownloadPath(download_path());
   }
 
   const base::FilePath& download_path() const {
     return scoped_download_directory_.path();
   }
 
  private:
@@ skipping 308 matching lines @@
 
   chrome::CloseAllBrowsers();
   EXPECT_FALSE(browser_shutdown::IsTryingToQuit());
   EXPECT_TRUE(chrome::BrowserIterator().done());
   EXPECT_TRUE(IsBackgroundModeSuspended());
 }
 
 INSTANTIATE_TEST_CASE_P(BrowserCloseManagerWithBackgroundModeBrowserTest,
                         BrowserCloseManagerWithBackgroundModeBrowserTest,
                         testing::Bool());