AutoFill auxiliary profiles should be off on non-Mac platforms.

chrome/browser/autofill/personal_data_manager.cc

Index: chrome/browser/autofill/personal_data_manager.cc
diff --git a/chrome/browser/autofill/personal_data_manager.cc b/chrome/browser/autofill/personal_data_manager.cc
index 43c06d17fb7a4d7bb27cb6cd7b2a0616101a2584..9e85f8841b2446f3cb73ff07c5dd93f043a8538e 100644
--- a/chrome/browser/autofill/personal_data_manager.cc
+++ b/chrome/browser/autofill/personal_data_manager.cc
@@ -405,6 +405,12 @@ const std::vector<AutoFillProfile*>& PersonalDataManager::profiles() {
 
   bool auxiliary_profiles_enabled = profile_->GetPrefs()->GetBoolean(
       prefs::kAutoFillAuxiliaryProfilesEnabled);
+
+#if !defined(OS_MACOSX)
+  DCHECK(!auxiliary_profiles_enabled)
+      << "Auxiliary profiles supported on Mac only";
+#endif
+
   if (auxiliary_profiles_enabled) {
     profiles_.clear();