Disable test made flaky by DCHECK() on Mac

chrome/browser/password_manager/credential_manager_browsertest.cc

Index: chrome/browser/password_manager/credential_manager_browsertest.cc
diff --git a/chrome/browser/password_manager/credential_manager_browsertest.cc b/chrome/browser/password_manager/credential_manager_browsertest.cc
index 84792c6f49fea6686fc0d15dca71043ee7cf2209..d9fc7fe4d8ef7c4fc3c33d84d0b9443e66c41038 100644
--- a/chrome/browser/password_manager/credential_manager_browsertest.cc
+++ b/chrome/browser/password_manager/credential_manager_browsertest.cc
@@ -81,8 +81,16 @@ IN_PROC_BROWSER_TEST_F(CredentialManagerBrowserTest,
   EXPECT_FALSE(form.skip_zero_click);
 }
 
+// TODO(crbug.com/626759): flakily failing on Mac.
+#if defined(OS_MACOSX)
+#define MAYBE_AutoSigninOldCredentialAndNavigation \
+    DISABLED_AutoSigninOldCredentialAndNavigation
+#else
+#define MAYBE_AutoSigninOldCredentialAndNavigation \
+    AutoSigninOldCredentialAndNavigation
+#endif
 IN_PROC_BROWSER_TEST_F(CredentialManagerBrowserTest,
-                       AutoSigninOldCredentialAndNavigation) {
+                       MAYBE_AutoSigninOldCredentialAndNavigation) {
   // Save credentials with 'skip_zero_click' false.
   scoped_refptr<password_manager::TestPasswordStore> password_store =
       static_cast<password_manager::TestPasswordStore*>(