Get original profile when getting all policy values.

GetAllPolicyValues function requires SchemaRegistryService for the unknown
policy error. SchemaRegistryService is not avaiable for the offTheRecord
BrowserContext. Original profile is needed for the error message.

Bug: 860741
Change-Id: I6bf7cbf10d03c4c71b75d9a9b01264f5a2d6fcc5
Reviewed-on: https://chromium-review.googlesource.com/1128173Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573333}

chrome/browser/policy/policy_conversions.cc

@@ -14,6 +14,7 @@
 #include "chrome/browser/policy/profile_policy_connector_factory.h"
 #include "chrome/browser/policy/schema_registry_service.h"
 #include "chrome/browser/policy/schema_registry_service_factory.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/policy/core/browser/policy_error_map.h"
 #include "components/policy/core/common/policy_details.h"
@@ -200,6 +201,8 @@ std::unique_ptr<base::DictionaryValue> GetAllPolicyValuesAsDictionary(
   if (!context)
     return std::make_unique<base::DictionaryValue>(std::move(all_policies));
 
+  context = chrome::GetBrowserContextRedirectedInIncognito(context);
+
   // Add Chrome policy values.
   auto chrome_policies = std::make_unique<base::DictionaryValue>();
   GetChromePolicyValues(context, chrome_policies.get(), with_user_policies,