Revert of Rename PrivateMode enum values:

net/quic/quic_session_key.cc

 // Copyright 2014 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/quic/quic_session_key.h"
 
 using std::string;
 
 namespace net {
 
@@ skipping 27 matching lines @@
 }
 
 bool QuicSessionKey::operator==(const QuicSessionKey& other) const {
   return is_https_ == other.is_https_ &&
       privacy_mode_ == other.privacy_mode_ &&
       host_port_pair_.Equals(other.host_port_pair_);
 }
 
 string QuicSessionKey::ToString() const {
   return (is_https_ ? "https://" : "http://") + host_port_pair_.ToString() +
-      (privacy_mode_ == PRIVACY_MODE_ENABLED ? "/private" : "");
+      (privacy_mode_ == kPrivacyModeEnabled ? "/private" : "");
 }
 
 }  // namespace net