Allow multiple sql::Connection error delegates.

sql/connection.cc

 // 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.
 
 #include "sql/connection.h"
 
 #include <string.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 586 matching lines @@
 
   // The cache clear will get most statements. There may be still be references
   // to some statements that are held by others (including one-shot statements).
   // This will deactivate them so they can't be used again.
   for (StatementRefSet::iterator i = open_statements_.begin();
        i != open_statements_.end(); ++i)
     (*i)->Close();
 }
 
 int Connection::OnSqliteError(int err, sql::Statement *stmt) {
-  if (error_delegate_.get())
-    return error_delegate_->OnError(err, this, stmt);
+  if (!error_delegates_.empty()) {
+    std::vector<scoped_refptr<ErrorDelegate> > delegates = error_delegates_;
+    for (size_t i = 0; err != SQLITE_OK && i < delegates.size(); ++i) {
+      err = delegates[i]->OnError(err, this, stmt);
+    }
+    return err;
+  }
   // The default handling is to assert on debug and to ignore on release.
   DLOG(FATAL) << GetErrorMessage();
   return err;
 }
 
 }  // namespace sql