[SPDY] Do not advertise SPDY/2 by default

net/spdy/buffered_spdy_framer.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/buffered_spdy_framer.h"
 
 #include "base/logging.h"
 
 namespace net {
 
 SpdyMajorVersion NextProtoToSpdyMajorVersion(NextProto next_proto) {
   switch (next_proto) {
-    case kProtoSPDY2:
+    case kProtoDeprecatedSPDY2:
       return SPDY2;
     case kProtoSPDY3:
     case kProtoSPDY31:
       return SPDY3;
     // SPDY/4 and HTTP/2 share the same framing for now.
     case kProtoSPDY4a2:
     case kProtoHTTP2Draft04:
       return SPDY4;
     case kProtoUnknown:
     case kProtoHTTP11:
@@ skipping 296 matching lines @@
 
 void BufferedSpdyFramer::InitHeaderStreaming(SpdyStreamId stream_id) {
   memset(header_buffer_, 0, kHeaderBufferSize);
   header_buffer_used_ = 0;
   header_buffer_valid_ = true;
   header_stream_id_ = stream_id;
   DCHECK_NE(header_stream_id_, SpdyFramer::kInvalidStream);
 }
 
 }  // namespace net