[Sync] Add history delete directive type

chrome/common/pref_names.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/common/pref_names.h"
 
 #include "base/basictypes.h"
 
 namespace prefs {
 
@@ skipping 1602 matching lines @@
 const char kSyncAppSettings[] = "sync.app_settings";
 const char kSyncApps[] = "sync.apps";
 const char kSyncAutofill[] = "sync.autofill";
 const char kSyncAutofillProfile[] = "sync.autofill_profile";
 const char kSyncThemes[] = "sync.themes";
 const char kSyncTypedUrls[] = "sync.typed_urls";
 const char kSyncExtensions[] = "sync.extensions";
 const char kSyncExtensionSettings[] = "sync.extension_settings";
 const char kSyncSearchEngines[] = "sync.search_engines";
 const char kSyncSessions[] = "sync.sessions";
+const char kSyncHistoryDeleteDirectives[] = "sync.history_delete_directives";
 
 // Boolean used by enterprise configuration management in order to lock down
 // sync.
 const char kSyncManaged[] = "sync.managed";
 
 // Boolean to prevent sync from automatically starting up.  This is
 // used when sync is disabled by the user via the privacy dashboard.
 const char kSyncSuppressStart[] = "sync.suppress_start";
 
 // List of the currently acknowledged set of sync types, used to figure out
@@ skipping 459 matching lines @@
 // Tracks the time of the last shown warning. Used to reset
 // |network_profile.warnings_left| after a silence period.
 const char kNetworkProfileLastWarningTime[] =
     "network_profile.last_warning_time";
 
 // 64-bit serialization of the time last policy usage statistics were collected
 // by UMA_HISTOGRAM_ENUMERATION.
 const char kLastPolicyStatisticsUpdate[] = "policy.last_statistics_update";
 
 }  // namespace prefs