Add a notice about other forms of history to the CBD dialog

chrome/common/pref_names.h

 // 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 288 matching lines @@
 extern const char kDeauthorizeContentLicenses[];
 extern const char kEnableContinuousSpellcheck[];
 extern const char kSpeechRecognitionFilterProfanities[];
 extern const char kSavingBrowserHistoryDisabled[];
 extern const char kAllowDeletingBrowserHistory[];
 extern const char kForceGoogleSafeSearch[];
 extern const char kForceYouTubeSafetyMode[];
 extern const char kRecordHistory[];
 extern const char kDeleteTimePeriod[];
 extern const char kLastClearBrowsingDataTime[];
+extern const char kClearBrowsingDataHistoryNoticeShownTimes[];
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 extern const char kUsesSystemTheme[];
 #endif
 extern const char kCurrentThemePackFilename[];
 extern const char kCurrentThemeID[];
 extern const char kCurrentThemeImages[];
 extern const char kCurrentThemeColors[];
 extern const char kCurrentThemeTints[];
 extern const char kCurrentThemeDisplayProperties[];
 extern const char kExtensionsUIDeveloperMode[];
@@ skipping 488 matching lines @@
 #if defined(GOOGLE_CHROME_BUILD)
 extern const char kMediaRouterCloudServicesPrefSet[];
 extern const char kMediaRouterEnableCloudServices[];
 #endif  // defined(GOOGLE_CHROME_BUILD)
 extern const char kMediaRouterFirstRunFlowAcknowledged[];
 #endif
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_