Disable ProfileListDesktopBrowserTest.SignOut on Linux

chrome/browser/profiles/profile_list_desktop_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/command_line.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "build/build_config.h"
@@ skipping 41 matching lines @@
 };
 
 #if defined(OS_WIN) || (defined(OS_MACOSX) && defined(ADDRESS_SANITIZER))
 // SignOut is flaky on Windows, crbug.com/357329,
 // and Mac with ASAN, crbug.com/674497.
 #define MAYBE_SignOut DISABLED_SignOut
 #elif defined(OS_CHROMEOS)
 // This test doesn't make sense for Chrome OS since it has a different
 // multi-profiles menu in the system tray instead.
 #define MAYBE_SignOut DISABLED_SignOut
+#elif defined(OS_LINUX)
+// Flaky on Linux debug builds with libc++ (https://crbug.com/734875)
+#define MAYBE_SignOut DISABLED_SignOut
 #else
 #define MAYBE_SignOut SignOut
 #endif
 IN_PROC_BROWSER_TEST_F(ProfileListDesktopBrowserTest, MAYBE_SignOut) {
   if (!profiles::IsMultipleProfilesEnabled())
     return;
 
   ProfileManager* profile_manager = g_browser_process->profile_manager();
   Profile* current_profile = browser()->profile();
   ProfileAttributesStorage& storage =
@@ skipping 68 matching lines @@
                         false, ProfileMetrics::SWITCH_PROFILE_ICON);
   EXPECT_EQ(2u, browser_list->size());
 
   // Switch to the first profile without opening a new window.
   menu->SwitchToProfile(menu->GetIndexOfItemWithProfilePath(path_profile1),
                         false, ProfileMetrics::SWITCH_PROFILE_ICON);
   EXPECT_EQ(2u, browser_list->size());
   EXPECT_EQ(path_profile1, browser_list->get(0)->profile()->GetPath());
   EXPECT_EQ(path_profile2, browser_list->get(1)->profile()->GetPath());
 }