In rtc::ByteBuffer drop support for ORDER_HOST as unused

Bug: None
Change-Id: Ideab428b13d981cddf9784cfd07fb7dfb2e914fe
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/159698
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29803}

pc/sctp_utils.cc

@@ -169,8 +169,7 @@ bool WriteDataChannelOpenMessage(const std::string& label,
   }
 
   rtc::ByteBufferWriter buffer(NULL,
-                               20 + label.length() + config.protocol.length(),
-                               rtc::ByteBuffer::ORDER_NETWORK);
+                               20 + label.length() + config.protocol.length());
   // TODO(tommi): Add error handling and check resulting length.
   buffer.WriteUInt8(DATA_CHANNEL_OPEN_MESSAGE_TYPE);
   buffer.WriteUInt8(channel_type);