Extracted NetLog class's inner enum types into their own enum classes and

net/ftp/ftp_ctrl_response_buffer.cc

Index: net/ftp/ftp_ctrl_response_buffer.cc
diff --git a/net/ftp/ftp_ctrl_response_buffer.cc b/net/ftp/ftp_ctrl_response_buffer.cc
index 1195d66b54a7a5f5935f4917fde6bdced52ef77f..419eda6fce0e9def70314f5c0d11f9a7cd042404 100644
--- a/net/ftp/ftp_ctrl_response_buffer.cc
+++ b/net/ftp/ftp_ctrl_response_buffer.cc
@@ -12,6 +12,7 @@
 #include "base/strings/string_piece.h"
 #include "base/values.h"
 #include "net/base/net_errors.h"
+#include "net/log/net_log_event_type.h"
 
 namespace net {
 
@@ -101,7 +102,7 @@ FtpCtrlResponse FtpCtrlResponseBuffer::PopResponse() {
   FtpCtrlResponse result = responses_.front();
   responses_.pop();
 
-  net_log_.AddEvent(NetLog::TYPE_FTP_CONTROL_RESPONSE,
+  net_log_.AddEvent(NetLogEventType::FTP_CONTROL_RESPONSE,
                     base::Bind(&NetLogFtpCtrlResponseCallback, &result));
 
   return result;