Linux: delete the unencrypted login database file after a successful password migration.

chrome/browser/password_manager/login_database.h

 // Copyright (c) 2010 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_PASSWORD_MANAGER_LOGIN_DATABASE_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_LOGIN_DATABASE_H_
 
 #include <string>
 #include <vector>
 
 #include "app/sql/connection.h"
 #include "app/sql/meta_table.h"
+#include "base/file_path.h"
 #include "base/string16.h"
 #include "webkit/glue/password_form.h"
 
-class FilePath;
 struct sqlite3;
 
 // Interface to the database storage of login information, intended as a helper
 // for PasswordStore on platforms that need internal storage of some or all of
 // the login information.
 class LoginDatabase {
  public:
   LoginDatabase();
   virtual ~LoginDatabase();
 
@@ skipping 35 matching lines @@
       std::vector<webkit_glue::PasswordForm*>* forms) const;
 
   // Loads the complete list of autofillable password forms (i.e., not blacklist
   // entries) into |forms|.
   bool GetAutofillableLogins(
       std::vector<webkit_glue::PasswordForm*>* forms) const;
 
   // Loads the complete list of blacklist forms into |forms|.
   bool GetBlacklistLogins(std::vector<webkit_glue::PasswordForm*>* forms) const;
 
+  // Deletes the login database file on disk, and creates a new, empty database.
+  // This can be used after migrating passwords to some other store, to ensure
+  // that SQLite doesn't leave fragments of passwords in the database file.
+  // Returns true on success; otherwise, whether the file was deleted and
+  // whether further use of this login database will succeed is unspecified.
+  bool DeleteAndRecreateDatabaseFile();
+
  private:
   // Returns an encrypted version of plain_text.
   std::string EncryptedString(const string16& plain_text) const;
 
   // Returns a decrypted version of cipher_text.
   string16 DecryptedString(const std::string& cipher_text) const;
 
   bool InitLoginsTable();
   void MigrateOldVersionsAsNeeded();
 
   // Fills |form| from the values in the given statement (which is assumed to
   // be of the form used by the Get*Logins methods).
   void InitPasswordFormFromStatement(webkit_glue::PasswordForm* form,
                                      sql::Statement& s) const;
 
   // Loads all logins whose blacklist setting matches |blacklisted| into
   // |forms|.
   bool GetAllLoginsWithBlacklistSetting(
       bool blacklisted, std::vector<webkit_glue::PasswordForm*>* forms) const;
 
+  FilePath db_path_;
   mutable sql::Connection db_;
   sql::MetaTable meta_table_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginDatabase);
 };
 
-
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_LOGIN_DATABASE_H_