Show a warning when the history files can't be read correctly....

chrome/browser/history/history.h

 // Copyright (c) 2009 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_HISTORY_HISTORY_H__
 #define CHROME_BROWSER_HISTORY_HISTORY_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 595 matching lines @@
   // backend.
   void SetFavicon(const GURL& page_url,
                   const GURL& icon_url,
                   const std::vector<unsigned char>& image_data);
 
 
   // Sets the in-memory URL database. This is called by the backend once the
   // database is loaded to make it available.
   void SetInMemoryBackend(history::InMemoryHistoryBackend* mem_backend);
 
-  // Called by our BackendDelegate when the database version is too new to be
-  // read properly.
-  void NotifyTooNew();
+  // Called by our BackendDelegate when there is a problem reading the database.
+  // |message_id| is the relevant message in the string table to display.
+  void NotifyProfileError(int message_id);
 
   // Call to schedule a given task for running on the history thread with the
   // specified priority. The task will have ownership taken.
   void ScheduleTask(SchedulePriority priority, Task* task);
 
   // Schedule ------------------------------------------------------------------
   //
   // Functions for scheduling operations on the history thread that have a
   // handle and may be cancelable. For fire-and-forget operations, see
   // ScheduleAndForget below.
@@ skipping 166 matching lines @@
   bool backend_loaded_;
 
   // Cached values from Init(), used whenever we need to reload the backend.
   FilePath history_dir_;
   BookmarkService* bookmark_service_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_H__