Remove unnecessary attempts at memory cleaning

net/base/auth.cc

 // 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.
 
 #include "net/base/auth.h"
-#include "net/base/zap.h"
 
 namespace net {
 
 AuthChallengeInfo::AuthChallengeInfo() : is_proxy(false) {
 }
 
 bool AuthChallengeInfo::Equals(const AuthChallengeInfo& that) const {
   return (this->is_proxy == that.is_proxy &&
           this->challenger == that.challenger && this->scheme == that.scheme &&
           this->realm == that.realm);
@@ skipping 21 matching lines @@
 }
 
 bool AuthCredentials::Equals(const AuthCredentials& other) const {
   return username_ == other.username_ && password_ == other.password_;
 }
 
 bool AuthCredentials::Empty() const {
   return username_.empty() && password_.empty();
 }
 
-void AuthCredentials::Zap() {
-  ZapString(&password_);
-}
-
 }  // namespace net