Fix crash of ExtensionManagement in guest mode

chrome/browser/extensions/extension_management.cc

 // Copyright 2014 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/extension_management.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/extensions/external_provider_impl.h"
 #include "chrome/browser/extensions/standard_management_policy_provider.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/crx_file/id_util.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "extensions/browser/pref_names.h"
 #include "extensions/common/url_pattern.h"
 
 namespace extensions {
 
 void ExtensionManagement::IndividualSettings::Reset() {
   installation_mode = ExtensionManagement::INSTALLATION_ALLOWED;
@@ skipping 220 matching lines @@
 
 ExtensionManagementFactory::~ExtensionManagementFactory() {
 }
 
 KeyedService* ExtensionManagementFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   return new ExtensionManagement(
       Profile::FromBrowserContext(context)->GetPrefs());
 }
 
+content::BrowserContext* ExtensionManagementFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextRedirectedInIncognito(context);
+}
+
 }  // namespace extensions