Remove connect message from Native Messaging API

chrome/test/data/native_messaging/native_hosts/echo.py

 #!/usr/bin/env python
 # 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.
 
 # A simple native client in python.
-# All this client does is echo the text it recieves back at the extension.
+# All this client does is echo the text it receives back at the extension.
 
 import sys
 import struct
 
-MESSAGE_TYPE_SEND_MESSAGE_REQUEST = 0
-MESSAGE_TYPE_SEND_MESSAGE_RESPONSE = 1
-MESSAGE_TYPE_CONNECT = 2
-MESSAGE_TYPE_CONNECT_MESSAGE = 3
-
 def Main():
   message_number = 0
 
   while 1:
     # Read the message type (first 4 bytes).
-    type_bytes = sys.stdin.read(4)
+    text_length_bytes = sys.stdin.read(4)
 
-    if len(type_bytes) == 0:
+    if len(text_length_bytes) == 0:
       break
 
-    message_type = struct.unpack('i', type_bytes)[0]
-
     # Read the message length (4 bytes).
-    text_length = struct.unpack('i', sys.stdin.read(4))[0]
+    text_length = struct.unpack('i', text_length_bytes)[0]
 
     # Read the text (JSON object) of the message.
     text = sys.stdin.read(text_length).decode('utf-8')
 
     message_number += 1
 
     response = '{{"id": {0}, "echo": {1}}}'.format(message_number,
-                                                  text).encode('utf-8')
-
-    # Choose the correct message type for the response.
-    if message_type == MESSAGE_TYPE_SEND_MESSAGE_REQUEST:
-      response_type = MESSAGE_TYPE_SEND_MESSAGE_RESPONSE
-    else:
-      response_type = MESSAGE_TYPE_CONNECT_MESSAGE
+                                                   text).encode('utf-8')
 
     try:
-      sys.stdout.write(struct.pack("II", response_type, len(response)))
+      sys.stdout.write(struct.pack("I", len(response)))
       sys.stdout.write(response)
       sys.stdout.flush()
     except IOError:
       break
 
 if __name__ == '__main__':
   Main()