QuicSession no longer directly owns its QuicConnection. Not flag protected.

net/tools/quic/quic_client_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.
 //
 // A client specific QuicSession subclass.
 
 #ifndef NET_TOOLS_QUIC_QUIC_CLIENT_SESSION_H_
 #define NET_TOOLS_QUIC_QUIC_CLIENT_SESSION_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "net/quic/core/quic_client_session_base.h"
 #include "net/quic/core/quic_crypto_client_stream.h"
 #include "net/quic/core/quic_protocol.h"
 #include "net/tools/quic/quic_spdy_client_stream.h"
 
 namespace net {
 
 class QuicConnection;
 class QuicServerId;
 class ReliableQuicStream;
 
 class QuicClientSession : public QuicClientSessionBase {
  public:
-  // Caller retains ownership of |promised_by_url|.
+  // Takes ownership of |connection|. Caller retains ownership of
+  // |promised_by_url|.
   QuicClientSession(const QuicConfig& config,
                     QuicConnection* connection,
                     const QuicServerId& server_id,
                     QuicCryptoClientConfig* crypto_config,
                     QuicClientPushPromiseIndex* push_promise_index);
   ~QuicClientSession() override;
   // Set up the QuicClientSession. Must be called prior to use.
   void Initialize() override;
 
   // QuicSession methods:
@@ skipping 51 matching lines @@
   // If this is set to false, the client will ignore server GOAWAYs and allow
   // the creation of streams regardless of the high chance they will fail.
   bool respect_goaway_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicClientSession);
 };
 
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_CLIENT_SESSION_H_