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

chrome/browser/ui/webui/options/clear_browser_data_handler.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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/browsing_data/browsing_data_counter.h"
@@ skipping 40 matching lines @@
   // Adds a |counter| for browsing data.
   void AddCounter(scoped_ptr<BrowsingDataCounter> counter);
 
   // Updates a counter in the UI according to the |result|.
   void UpdateCounterText(scoped_ptr<BrowsingDataCounter::Result> result);
 
   // Implementation of SyncServiceObserver. Updates the support string at the
   // bottom of the dialog.
   void OnStateChanged() override;
 
+  // Whether we should show the footer message informing the user about other
+  // forms of browsing history.
+  bool ShouldShowHistoryFooter();
+
   // If non-null it means removal is in progress.
   BrowsingDataRemover* remover_;
 
   // Keeps track of whether clearing LSO data is supported.
   BooleanPrefMember clear_plugin_lso_data_enabled_;
 
   // Keeps track of whether Pepper Flash is enabled and thus Flapper-specific
   // settings and removal options (e.g. Content Licenses) are available.
   BooleanPrefMember pepper_flash_settings_enabled_;
 
   // Keeps track of whether deleting browsing history and downloads is allowed.
   BooleanPrefMember allow_deleting_browser_history_;
 
   // Counters that calculate the data volume for some of the data types.
   ScopedVector<BrowsingDataCounter> counters_;
 
   // Informs us whether the user is syncing their data.
   ProfileSyncService* sync_service_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearBrowserDataHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_