Disable ProfileListDesktopBrowserTest.SignOut on ASAN on Mac.

chrome/browser/profiles/profile_list_desktop_browsertest.cc

Index: chrome/browser/profiles/profile_list_desktop_browsertest.cc
diff --git a/chrome/browser/profiles/profile_list_desktop_browsertest.cc b/chrome/browser/profiles/profile_list_desktop_browsertest.cc
index 154c4c8cd7787da55f99e69b6ab56bc2450ff047..34aea035535dbadf63d9cb7a986e9261c8cd367d 100644
--- a/chrome/browser/profiles/profile_list_desktop_browsertest.cc
+++ b/chrome/browser/profiles/profile_list_desktop_browsertest.cc
@@ -50,8 +50,9 @@ class ProfileListDesktopBrowserTest : public InProcessBrowserTest {
   DISALLOW_COPY_AND_ASSIGN(ProfileListDesktopBrowserTest);
 };
 
-#if defined(OS_WIN)
-// SignOut is flaky. So far only observed on Windows. crbug.com/357329.
+#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