Fix sbox_validation_tests for Server 2012R2

Windows Server 2012 returns code 1285L instead of ERROR_ACCESS_DENIED.
So sbox_validation_tests fails on Windows Server 2012 R2.

R=cpu@chromium.org
BUG=411859

Review URL: https://codereview.chromium.org/543003002

Cr-Commit-Position: refs/heads/master@{#294335}

sandbox/win/tests/validation_tests/commands.cc

@@ -267,7 +267,7 @@ int TestOpenAlternateDesktop(wchar_t *desktop_name) {
                                        DACL_SECURITY_INFORMATION, NULL, NULL,
                                        NULL, NULL);
       ::CloseHandle(test_handle);
-      if (result != ERROR_ACCESS_DENIED) {
+      if (result == ERROR_SUCCESS) {
         return SBOX_TEST_SUCCEEDED;
       }
     } else if (::GetLastError() != ERROR_ACCESS_DENIED) {