[Sync] Add history delete directive type

chrome/browser/sync/sync_prefs.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/sync/sync_prefs.h"
 
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
 #include "build/build_config.h"
@@ skipping 204 matching lines @@
     case syncer::APP_SETTINGS:
       return prefs::kSyncAppSettings;
     case syncer::APPS:
       return prefs::kSyncApps;
     case syncer::SEARCH_ENGINES:
       return prefs::kSyncSearchEngines;
     case syncer::SESSIONS:
       return prefs::kSyncSessions;
     case syncer::APP_NOTIFICATIONS:
       return prefs::kSyncAppNotifications;
+    case syncer::HISTORY_DELETE_DIRECTIVES:
+      return prefs::kSyncHistoryDeleteDirectives;
     default:
       break;
   }
   NOTREACHED();
   return NULL;
 }
 
 #if defined(OS_CHROMEOS)
 std::string SyncPrefs::GetSpareBootstrapToken() const {
   DCHECK(CalledOnValidThread());
@@ skipping 198 matching lines @@
     if (types.Has(i->first))
       types_with_groups.PutAll(i->second);
     else
       types_with_groups.RemoveAll(i->second);
   }
   types_with_groups.RetainAll(registered_types);
   return types_with_groups;
 }
 
 }  // namespace browser_sync