Disable test made flaky by DCHECK() on Mac

chrome/browser/password_manager/credential_manager_browsertest.cc

 // Copyright 2016 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 "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/password_manager/password_manager_test_base.h"
 #include "chrome/browser/password_manager/password_store_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 63 matching lines @@
   auto& passwords_map = password_store->stored_passwords();
   ASSERT_EQ(1u, passwords_map.size());
   auto& passwords_vector = passwords_map.begin()->second;
   ASSERT_EQ(1u, passwords_vector.size());
   const autofill::PasswordForm& form = passwords_vector[0];
   EXPECT_EQ(base::ASCIIToUTF16("user"), form.username_value);
   EXPECT_EQ(base::ASCIIToUTF16("password"), form.password_value);
   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*>(
           PasswordStoreFactory::GetForProfile(
               browser()->profile(), ServiceAccessType::IMPLICIT_ACCESS).get());
   autofill::PasswordForm signin_form;
   signin_form.signon_realm = embedded_test_server()->base_url().spec();
   signin_form.password_value = base::ASCIIToUTF16("password");
   signin_form.username_value = base::ASCIIToUTF16("user");
   signin_form.origin = embedded_test_server()->base_url();
@@ skipping 97 matching lines @@
       "document.getElementById('input_submit_button').click();"));
   form_submit_observer.Wait();
   EXPECT_FALSE(prompt_observer->IsShowingSavePrompt());
   EXPECT_FALSE(prompt_observer->IsShowingUpdatePrompt());
   stored = password_store->stored_passwords();
   ASSERT_EQ(1u, stored.size());
   EXPECT_EQ(signin_form, stored[signin_form.signon_realm][0]);
 }
 
 }  // namespace