Added check for behavior feature existense

chrome/common/extensions/sync_helper.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/common/extensions/sync_helper.h"
 
 #include "base/logging.h"
 #include "chrome/common/extensions/api/plugins/plugins_handler.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.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_url_handlers.h"
 #include "extensions/common/permissions/permissions_data.h"
 
 namespace extensions {
 namespace sync_helper {
 
 bool IsSyncable(const Extension* extension) {
-  if (FeatureProvider::GetBehaviorFeature(BehaviorFeature::kDoNotSync)
-          ->IsAvailableToExtension(extension)
-          .is_available()) {
+  const Feature* feature =
+      FeatureProvider::GetBehaviorFeature(BehaviorFeature::kDoNotSync);
+  if (feature && feature->IsAvailableToExtension(extension).is_available())
     return false;
-  }
 
   // Default apps are not synced because otherwise they will pollute profiles
   // that don't already have them. Specially, if a user doesn't have default
   // apps, creates a new profile (which get default apps) and then enables sync
   // for it, then their profile everywhere gets the default apps.
   bool is_syncable = (extension->location() == Manifest::INTERNAL &&
                       !extension->was_installed_by_default());
   if (!is_syncable && !IsSyncableComponentExtension(extension)) {
     // We have a non-standard location.
     return false;
@@ skipping 44 matching lines @@
 
 bool IsSyncableComponentExtension(const Extension* extension) {
   if (!Manifest::IsComponentLocation(extension->location()))
     return false;
   return (extension->id() == extensions::kWebStoreAppId) ||
          (extension->id() == extension_misc::kChromeAppId);
 }
 
 }  // namespace sync_helper
 }  // namespace extensions