Added check for behavior feature existense

chrome/browser/extensions/extension_util.cc

 // Copyright 2013 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_util.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/values.h"
@@ skipping 10 matching lines @@
 #include "components/variations/variations_associated_data.h"
 #include "content/public/browser/site_instance.h"
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/extension_util.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_icon_set.h"
 #include "extensions/common/feature_switch.h"
 #include "extensions/common/features/behavior_feature.h"
+#include "extensions/common/features/feature.h"
 #include "extensions/common/features/feature_provider.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_handlers/app_isolation_info.h"
 #include "extensions/common/manifest_handlers/incognito_info.h"
 #include "extensions/common/permissions/permissions_data.h"
 #include "extensions/grit/extensions_browser_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 
 namespace extensions {
 namespace util {
 
 namespace {
 
 const char kSupervisedUserExtensionPermissionIncreaseFieldTrialName[] =
     "SupervisedUserExtensionPermissionIncrease";
 
 // The entry into the ExtensionPrefs for allowing an extension to script on
 // all urls without explicit permission.
 const char kExtensionAllowedOnAllUrlsPrefName[] =
     "extension_can_script_all_urls";
 
 // The entry into the prefs for when a user has explicitly set the "extension
 // allowed on all urls" pref.
 const char kHasSetScriptOnAllUrlsPrefName[] = "has_set_script_all_urls";
 
 // Returns true if |extension| should always be enabled in incognito mode.
 bool IsWhitelistedForIncognito(const Extension* extension) {
-  return FeatureProvider::GetBehaviorFeature(
-             BehaviorFeature::kWhitelistedForIncognito)
-      ->IsAvailableToExtension(extension)
-      .is_available();
+  const Feature* feature = FeatureProvider::GetBehaviorFeature(
+      BehaviorFeature::kWhitelistedForIncognito);
+  return feature && feature->IsAvailableToExtension(extension).is_available();
 }
 
 // Returns |extension_id|. See note below.
 std::string ReloadExtensionIfEnabled(const std::string& extension_id,
                                      content::BrowserContext* context) {
   ExtensionRegistry* registry = ExtensionRegistry::Get(context);
   bool extension_is_enabled =
       registry->enabled_extensions().Contains(extension_id);
 
   if (!extension_is_enabled)
@@ skipping 316 matching lines @@
   base::FieldTrialList::FindFullName(
       kSupervisedUserExtensionPermissionIncreaseFieldTrialName);
   std::string value = variations::GetVariationParamValue(
       kSupervisedUserExtensionPermissionIncreaseFieldTrialName,
       profile->IsChild() ? "child_account" : "legacy_supervised_user");
   return value == "true";
 }
 
 }  // namespace util
 }  // namespace extensions