[SPDY] Remove references to obsolete SPDY versions SPDY/1 and SPDY/2.1

net/spdy/spdy_session.cc

 // 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.
 
 #include "net/spdy/spdy_session.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 394 matching lines @@
       enable_ping_based_connection_checking_(
           enable_ping_based_connection_checking),
       protocol_(default_protocol),
       credential_state_(SpdyCredentialState::kDefaultNumSlots),
       connection_at_risk_of_loss_time_(
           base::TimeDelta::FromSeconds(kDefaultConnectionAtRiskOfLossSeconds)),
       hung_interval_(
           base::TimeDelta::FromSeconds(kHungIntervalSeconds)),
       trusted_spdy_proxy_(trusted_spdy_proxy),
       time_func_(time_func) {
-  // TODO(akalin): Change this to kProtoSPDYMinimumVersion once we
-  // stop supporting SPDY/1.
-  DCHECK_GE(protocol_, kProtoSPDY2);
+  DCHECK_GE(protocol_, kProtoSPDYMinimumVersion);
   DCHECK_LE(protocol_, kProtoSPDYMaximumVersion);
   DCHECK(HttpStreamFactory::spdy_enabled());
   net_log_.BeginEvent(
       NetLog::TYPE_SPDY_SESSION,
       base::Bind(&NetLogSpdySessionCallback, &host_port_proxy_pair()));
   next_unclaimed_push_stream_sweep_time_ = time_func_() +
       base::TimeDelta::FromSeconds(kMinPushedStreamLifetimeSeconds);
   // TODO(mbelshe): consider randomization of the stream_hi_water_mark.
 }
 
@@ skipping 35 matching lines @@
 
   connection_ = connection.Pass();
   is_secure_ = is_secure;
   certificate_error_code_ = certificate_error_code;
 
   NextProto protocol_negotiated =
       connection_->socket()->GetNegotiatedProtocol();
   if (protocol_negotiated != kProtoUnknown) {
     protocol_ = protocol_negotiated;
   }
-  // TODO(akalin): Change this to kProtoSPDYMinimumVersion once we
-  // stop supporting SPDY/1.
-  DCHECK_GE(protocol_, kProtoSPDY2);
+  DCHECK_GE(protocol_, kProtoSPDYMinimumVersion);
   DCHECK_LE(protocol_, kProtoSPDYMaximumVersion);
 
   SSLClientSocket* ssl_socket = GetSSLClientSocket();
   if (ssl_socket && ssl_socket->WasChannelIDSent()) {
     // According to the SPDY spec, the credential associated with the TLS
     // connection is stored in slot[1].
     credential_state_.SetHasCredential(GURL("https://" +
                                             host_port_pair().ToString()));
   }
 
@@ skipping 2449 matching lines @@
     if (!queue->empty()) {
       SpdyStreamId stream_id = queue->front();
       queue->pop_front();
       return stream_id;
     }
   }
   return 0;
 }
 
 }  // namespace net