Move NextProto enum to a new file net/socket/next_proto.h

net/http/http_proxy_client_socket.cc

Index: net/http/http_proxy_client_socket.cc
diff --git a/net/http/http_proxy_client_socket.cc b/net/http/http_proxy_client_socket.cc
index 1a2bac5eaac4e7bb2853b2be3b53fcea304e5e34..47aaa7b8a46971f0abab4940f8d41f67395f8496 100644
--- a/net/http/http_proxy_client_socket.cc
+++ b/net/http/http_proxy_client_socket.cc
@@ -34,7 +34,7 @@ HttpProxyClientSocket::HttpProxyClientSocket(
     HttpAuthHandlerFactory* http_auth_handler_factory,
     bool tunnel,
     bool using_spdy,
-    SSLClientSocket::NextProto protocol_negotiated,
+    NextProto protocol_negotiated,
     bool is_https_proxy)
     : ALLOW_THIS_IN_INITIALIZER_LIST(io_callback_(
         base::Bind(&HttpProxyClientSocket::OnIOComplete,
@@ -92,8 +92,7 @@ bool HttpProxyClientSocket::IsUsingSpdy() const {
   return using_spdy_;
 }
 
-SSLClientSocket::NextProto
-HttpProxyClientSocket::GetProtocolNegotiated() const {
+NextProto HttpProxyClientSocket::GetProtocolNegotiated() const {
   return protocol_negotiated_;
 }