Make extensions developer mode adhere to policy

chrome/browser/extensions/api/developer_private/developer_private_api.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/developer_private/developer_private_api.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 146 matching lines @@
   UMA_HISTOGRAM_BOOLEAN("ExtensionSettings.ShouldDoVerificationCheck",
                         should_do_verification_check);
   if (should_do_verification_check)
     InstallVerifier::Get(context)->VerifyAllExtensions();
 }
 
 std::unique_ptr<developer::ProfileInfo> CreateProfileInfo(Profile* profile) {
   std::unique_ptr<developer::ProfileInfo> info(new developer::ProfileInfo());
   info->is_supervised = profile->IsSupervised();
   PrefService* prefs = profile->GetPrefs();
+  const PrefService::Preference* pref =
+      prefs->FindPreference(prefs::kExtensionsUIDeveloperMode);
   info->is_incognito_available =
       IncognitoModePrefs::GetAvailability(prefs) !=
           IncognitoModePrefs::DISABLED;
+  info->is_developer_mode_controlled_by_policy = pref->IsManaged();
   info->in_developer_mode =
       !info->is_supervised &&
       prefs->GetBoolean(prefs::kExtensionsUIDeveloperMode);
   info->app_info_dialog_enabled = CanShowAppInfoDialog();
   info->can_load_unpacked =
       !ExtensionManagementFactory::GetForBrowserContext(profile)
           ->BlacklistedByDefault();
   return info;
 }
 
@@ skipping 1273 matching lines @@
         update.extension_id, update.command_name, *update.keybinding);
   }
 
   return RespondNow(NoArguments());
 }
 
 
 }  // namespace api
 
 }  // namespace extensions