Policy: check MustRemainInstalled in addition to UserMayModifySettings before offering uninstall

extensions/browser/api/management/management_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 "extensions/browser/api/management/management_api.h"
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 496 matching lines @@
   const Extension* target_extension =
       extensions::ExtensionRegistry::Get(browser_context())
           ->GetExtensionById(extension_id_, ExtensionRegistry::EVERYTHING);
   if (!target_extension ||
       ShouldNotBeVisible(target_extension, browser_context())) {
     error_ =
         ErrorUtils::FormatErrorMessage(keys::kNoExtensionError, extension_id_);
     return false;
   }
 
-  if (!ExtensionSystem::Get(browser_context())
-           ->management_policy()
-           ->UserMayModifySettings(target_extension, NULL)) {
+  ManagementPolicy* policy =
+      ExtensionSystem::Get(browser_context())->management_policy();
+  if (!policy->UserMayModifySettings(target_extension, nullptr) ||
+      policy->MustRemainInstalled(target_extension, nullptr)) {
     error_ = ErrorUtils::FormatErrorMessage(keys::kUserCantModifyError,
                                             extension_id_);
     return false;
   }
 
   if (auto_confirm_for_test == DO_NOT_SKIP) {
     if (show_confirm_dialog) {
       AddRef();  // Balanced in ExtensionUninstallAccepted/Canceled
       uninstall_dialog_ =
           delegate->UninstallFunctionDelegate(this, target_extension_id);
@@ skipping 363 matching lines @@
 ManagementAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 void ManagementAPI::OnListenerAdded(const EventListenerInfo& details) {
   management_event_router_.reset(new ManagementEventRouter(browser_context_));
   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 }  // namespace extensions