Revert of Disable the flaky RestartTest.PRE_LocalStorageClearedOnExit on Mac

chrome/browser/sessions/better_session_restore_browsertest.cc

Index: chrome/browser/sessions/better_session_restore_browsertest.cc
diff --git a/chrome/browser/sessions/better_session_restore_browsertest.cc b/chrome/browser/sessions/better_session_restore_browsertest.cc
index f20d30a5e45c895c802f7da6bf8417f2d22a4576..d1bb334903ba95b6a4d243cb9599693eefcc4b55 100644
--- a/chrome/browser/sessions/better_session_restore_browsertest.cc
+++ b/chrome/browser/sessions/better_session_restore_browsertest.cc
@@ -690,14 +690,7 @@
   CheckReloadedPageRestored();
 }
 
-// TODO(crbug.com/717740): This test is flaky on Mac.
-#if defined(OS_MACOSX)
-#defined MAYBE_PRE_LocalStorageClearedOnExit \
-    DISABLED_PRE_LocalStorageClearedOnExit
-#else
-#define MAYBE_PRE_LocalStorageClearedOnExit PRE_LocalStorageClearedOnExit
-#endif
-IN_PROC_BROWSER_TEST_F(RestartTest, MAYBE_PRE_LocalStorageClearedOnExit) {
+IN_PROC_BROWSER_TEST_F(RestartTest, PRE_LocalStorageClearedOnExit) {
   StoreDataWithPage("local_storage.html");
   CookieSettingsFactory::GetForProfile(browser()->profile())
       ->SetDefaultCookieSetting(CONTENT_SETTING_SESSION_ONLY);