Disable MultiProfileFileManagerBrowserTest.PRE_BasicDrive because flaky.

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

 // Copyright (c) 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 <stddef.h>
 
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/chromeos/file_manager/file_manager_browsertest_base.h"
@@ skipping 659 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest,
                        MAYBE_BasicDownloads) {
   AddAllUsers();
 
   // Sanity check that normal operations work in multi-profile setting as well.
   set_test_case_name("keyboardCopyDownloads");
   StartTest();
 }
 
+// Flaky: crbug.com/715961.
+// Previously it was disabled via DISABLE_SLOW_FILESAPP_TESTS and in
+// OFFICIAL_BUILD, see http://crbug.com/429294.
+IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest,
+                       DISABLED_PRE_BasicDrive) {
+  AddAllUsers();
+}
+
 // Fails on official build. http://crbug.com/429294
 #if defined(DISABLE_SLOW_FILESAPP_TESTS) || defined(OFFICIAL_BUILD)
-#define MAYBE_PRE_BasicDrive DISABLED_PRE_BasicDrive
 #define MAYBE_BasicDrive DISABLED_BasicDrive
 #else
-#define MAYBE_PRE_BasicDrive PRE_BasicDrive
 #define MAYBE_BasicDrive BasicDrive
 #endif
-IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest,
-                       MAYBE_PRE_BasicDrive) {
-  AddAllUsers();
-}
-
 IN_PROC_BROWSER_TEST_F(MultiProfileFileManagerBrowserTest, MAYBE_BasicDrive) {
   AddAllUsers();
 
   // Sanity check that normal operations work in multi-profile setting as well.
   set_test_case_name("keyboardCopyDrive");
   StartTest();
 }
 
 }  // namespace file_manager