Add mime type information to the download database

chrome/browser/history/download_database.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_HISTORY_DOWNLOAD_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_DOWNLOAD_DATABASE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 34 matching lines @@
 
   // Remove |id| from the database.
   void RemoveDownload(uint32 id);
 
   size_t CountDownloads();
 
  protected:
   // Returns the database for the functions in this interface.
   virtual sql::Connection& GetDB() = 0;
 
+  // Returns true if able to successfully add mime types to the downloads table.
+  bool MigrateMimeType();
+
   // Returns true if able to successfully rewrite the invalid values for the
   // |state| field from 3 to 4. Returns false if there was an error fixing the
   // database. See http://crbug.com/140687
   bool MigrateDownloadsState();
 
   // Returns true if able to successfully add the last interrupt reason and the
   // two target paths to downloads.
   bool MigrateDownloadsReasonPathsAndDangerType();
 
   // Returns true if able to successfully add the referrer column to the
@@ skipping 66 matching lines @@
   // doing the cleanup until after any DB migration and unless we are
   // actually use the downloads database.
   bool in_progress_entry_cleanup_completed_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadDatabase);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_DOWNLOAD_DATABASE_H_