Disable material design downloads UI from some tests.

chrome/browser/lifetime/browser_close_manager_browsertest.cc

Index: chrome/browser/lifetime/browser_close_manager_browsertest.cc
diff --git a/chrome/browser/lifetime/browser_close_manager_browsertest.cc b/chrome/browser/lifetime/browser_close_manager_browsertest.cc
index bbbddd9e32fa90e7c84bc64d349d9d479bbed09d..0eab958f094ee2fa911eb3588012cdc5f09d11cb 100644
--- a/chrome/browser/lifetime/browser_close_manager_browsertest.cc
+++ b/chrome/browser/lifetime/browser_close_manager_browsertest.cc
@@ -704,6 +704,13 @@ class BrowserCloseManagerWithDownloadsBrowserTest :
     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());