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

chrome/browser/ui/webui/options/clear_browser_data_handler.h

Index: chrome/browser/ui/webui/options/clear_browser_data_handler.h
diff --git a/chrome/browser/ui/webui/options/clear_browser_data_handler.h b/chrome/browser/ui/webui/options/clear_browser_data_handler.h
index 44786bc08803c30c982073f3abe189e3eab6f95b..5347df68a32e862660b5fdd10f98e04bb2fc3a33 100644
--- a/chrome/browser/ui/webui/options/clear_browser_data_handler.h
+++ b/chrome/browser/ui/webui/options/clear_browser_data_handler.h
@@ -58,6 +58,10 @@ class ClearBrowserDataHandler : public OptionsPageUIHandler,
   // 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_;