Use AuthCredentials throughout the network stack instead of username/password.

net/base/zap.h

+// Copyright (c) 2011 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 NET_BASE_ZAP_H_
+#define NET_BASE_ZAP_H_
+#pragma once
+
+#include <string>
+#include "base/string16.h"
+
+namespace net {
+
+// Zap functions are used to clear sensitive data in RAM to minimize the
+// time that people can access them once they are written to disk.
+
+// Overwrite a buffer  with 0's.
+void ZapBuf(void* buf, size_t buf_len);
+
+// Overwrite a string's internal buffer with 0's.
+void ZapString(std::string* s);
+
+// Overwrite a string16's internal buffer with 0's.
+void ZapString(string16* s);
+
+}  // net
+
+#endif  // NET_BASE_ZAP_H_