Break out balsa and epoll_server from net/tools/flip_server.

net/tools/balsa/http_message_constants.h

Index: net/tools/balsa/http_message_constants.h
diff --git a/net/tools/flip_server/http_message_constants.h b/net/tools/balsa/http_message_constants.h
similarity index 66%
rename from net/tools/flip_server/http_message_constants.h
rename to net/tools/balsa/http_message_constants.h
index de700ccedd8e39448ea07ea6e8de8fa2fb067c5e..2afa44e8e21b255c2c5ff49e6d8089cfcd0a0f9a 100644
--- a/net/tools/flip_server/http_message_constants.h
+++ b/net/tools/balsa/http_message_constants.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_TOOLS_FLIP_SERVER_HTTP_MESSAGE_CONSTANTS_H__
-#define NET_TOOLS_FLIP_SERVER_HTTP_MESSAGE_CONSTANTS_H__
+#ifndef NET_TOOLS_BALSA_HTTP_MESSAGE_CONSTANTS_H__
+#define NET_TOOLS_BALSA_HTTP_MESSAGE_CONSTANTS_H__
 
 namespace net {
 
@@ -13,5 +13,5 @@ extern const int http_status_code_count;
 
 }  // namespace net
 
-#endif  // NET_TOOLS_FLIP_SERVER_HTTP_MESSAGE_CONSTANTS_H__
+#endif  // NET_TOOLS_BALSA_HTTP_MESSAGE_CONSTANTS_H__