Remove X-Retry-After support.

net/tools/testserver/backoff_server.py

Index: net/tools/testserver/backoff_server.py
diff --git a/net/tools/testserver/backoff_server.py b/net/tools/testserver/backoff_server.py
index 3c6db1fd309cef8e96dab417274ff7e049feb6c2..8ad99bd1676a48dfca5df2f10782ff33b620baab 100755
--- a/net/tools/testserver/backoff_server.py
+++ b/net/tools/testserver/backoff_server.py
@@ -78,21 +78,14 @@ class RequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
 
     params = urlparse.parse_qs(urlparse.urlparse(self.path).query)
 
-    def SendCustomRetryIfRequested():
-      if params and 'custom-retry-after' in params:
-        custom_retry = params['custom-retry-after'][0]
-        self.send_header('X-Retry-After', custom_retry)
-
     if not params or not 'code' in params or params['code'][0] == '200':
       self.send_response(200)
       self.send_header('Content-Type', 'text/plain')
-      SendCustomRetryIfRequested()
       self.end_headers()
       self.wfile.write('OK')
     else:
       status_code = int(params['code'][0])
       self.send_response(status_code)
-      SendCustomRetryIfRequested()
       self.end_headers()
       self.wfile.write('Error %d' % int(status_code))