[sql] Static helper to delete database and all associated files.

sql/connection.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 SQL_CONNECTION_H_
 #define SQL_CONNECTION_H_
 
 #include <map>
 #include <set>
 #include <string>
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   // Breaks all outstanding transactions (as initiated by
   // BeginTransaction()), calls Raze() to destroy the database, then
   // closes the database.  After this is called, any operations
   // against the connections (or statements prepared by the
   // connection) should fail safely.
   //
   // The value from Raze() is returned, with Close() called in all
   // cases.
   bool RazeAndClose();
 
+  // Delete the underlying database files associated with |path|.
+  // This should be used on a database which has no existing
+  // connections.  If any other connections are open to the same
+  // database, this could cause odd results or corruption (for
+  // instance if a hot journal is deleted but the associated database
+  // is not).
+  //
+  // Returns true if the database file and associated journals no
+  // longer exist, false otherwise.  If the database has never
+  // existed, this will return true.
+  static bool Delete(const base::FilePath& path);
+
   // Transactions --------------------------------------------------------------
 
   // Transaction management. We maintain a virtual transaction stack to emulate
   // nested transactions since sqlite can't do nested transactions. The
   // limitation is you can't roll back a sub transaction: if any transaction
   // fails, all transactions open will also be rolled back. Any nested
   // transactions after one has rolled back will return fail for Begin(). If
   // Begin() fails, you must not call Commit or Rollback().
   //
   // Normally you should use sql::Transaction to manage a transaction, which
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   // Tag for auxiliary histograms.
   std::string histogram_tag_;
 
   DISALLOW_COPY_AND_ASSIGN(Connection);
 };
 
 }  // namespace sql
 
 #endif  // SQL_CONNECTION_H_