Enable QUIC for proxies only when QUIC is enabled

net/http/http_network_session.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 92 matching lines @@
     // Enables NPN support.  Note that ALPN is always enabled.
     bool enable_npn;
 
     // Enable setting of HTTP/2 dependencies based on priority.
     bool enable_priority_dependencies;
 
     // Enables QUIC support.
     bool enable_quic;
     // Disable QUIC if a connection times out with open streams.
     bool disable_quic_on_timeout_with_open_streams;
-    // Enables QUIC for proxies.
-    bool enable_quic_for_proxies;
     // Instruct QUIC to use consistent ephemeral ports when talking to
     // the same server.
     bool enable_quic_port_selection;
     // Disables QUIC's 0-RTT behavior.
     bool quic_always_require_handshake_confirmation;
     // Disables QUIC connection pooling.
     bool quic_disable_connection_pooling;
     // If not zero, the task to load QUIC server configs from the disk cache
     // will timeout after this value multiplied by the smoothed RTT for the
     // server.
@@ skipping 168 matching lines @@
 
   NextProtoVector next_protos_;
   bool enabled_protocols_[NUM_VALID_ALTERNATE_PROTOCOLS];
 
   Params params_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_