Disable StartupBrowserCreatorWelcomeBackTest.WelcomeBackStandardNoPolicy on Linux

Tbr: tmartino
Bug: 863743
Change-Id: I732c8f932cdc9be220b35c8d78f19bbc54e44dcb
Reviewed-on: https://chromium-review.googlesource.com/1138406Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575293}

chrome/browser/ui/startup/startup_browser_creator_browsertest.cc

@@ -1451,8 +1451,13 @@ IN_PROC_BROWSER_TEST_F(StartupBrowserCreatorWelcomeBackTest,
 }
 #endif  // defined(OS_WIN)
 
+#if defined(OS_LINUX)
+#define MAYBE_WelcomeBackStandardNoPolicy DISABLED_WelcomeBackStandardNoPolicy
+#else
+#define MAYBE_WelcomeBackStandardNoPolicy WelcomeBackStandardNoPolicy
+#endif
 IN_PROC_BROWSER_TEST_F(StartupBrowserCreatorWelcomeBackTest,
-                       WelcomeBackStandardNoPolicy) {
+                       MAYBE_WelcomeBackStandardNoPolicy) {
   ASSERT_NO_FATAL_FAILURE(
       StartBrowser(StartupBrowserCreator::WelcomeBackPage::kWelcomeStandard,
                    PolicyVariant()));