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

net/base/auth.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_AUTH_H__
 #define NET_BASE_AUTH_H__
 #pragma once
 
 #include <string>
 
@@ skipping 29 matching lines @@
 
  private:
   friend class base::RefCountedThreadSafe<AuthChallengeInfo>;
   ~AuthChallengeInfo();
 };
 
 // Authentication Credentials for an authentication credentials.
 class NET_EXPORT AuthCredentials {
  public:
   AuthCredentials();
+  AuthCredentials(const string16& username, const string16& password);
   ~AuthCredentials();
 
+  // Set the |username| and |password|.
+  void Set(const string16& username, const string16& password);
+
+  // Determines if |this| is equivalent to |other|.
+  bool Equals(const AuthCredentials& other) const;
+
+  // Returns true if all credentials are empty.
+  bool Empty() const;
+
+  // Overwrites the password memory to prevent it from being read if
+  // it's paged out to disk.
+  void Zap();
+
+  const string16& username() const { return username_; }
+  const string16& password() const { return password_; }
+
+ private:
   // The username to provide, possibly empty. This should be ASCII only to
   // minimize compatibility problems, but arbitrary UTF-16 strings are allowed
   // and will be attempted.
-  string16 username;
+  string16 username_;
 
   // The password to provide, possibly empty. This should be ASCII only to
   // minimize compatibility problems, but arbitrary UTF-16 strings are allowed
   // and will be attempted.
-  string16 password;
+  string16 password_;
 
   // Intentionally allowing the implicit copy constructor and assignment
   // operators.
 };
 
 // Authentication structures
 enum AuthState {
   AUTH_STATE_DONT_NEED_AUTH,
   AUTH_STATE_NEED_AUTH,
   AUTH_STATE_HAVE_AUTH,
   AUTH_STATE_CANCELED
 };
 
 class AuthData : public base::RefCountedThreadSafe<AuthData> {
  public:
   AuthState state;  // whether we need, have, or gave up on authentication.
   AuthCredentials credentials; // The credentials to use for auth.
 
   // We wouldn't instantiate this class if we didn't need authentication.
   AuthData();
 
  private:
   friend class base::RefCountedThreadSafe<AuthData>;
   ~AuthData();
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_AUTH_H__