Update from https://crrev.com/314320

net/data/websocket/truncated-headers_wsh.py

Index: net/data/websocket/truncated-headers_wsh.py
diff --git a/net/data/websocket/truncated-headers_wsh.py b/net/data/websocket/truncated-headers_wsh.py
new file mode 100644
index 0000000000000000000000000000000000000000..70ce2f28eae9d63daffe25cea9ee6140d79112d7
--- /dev/null
+++ b/net/data/websocket/truncated-headers_wsh.py
@@ -0,0 +1,19 @@
+# Copyright 2015 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.
+
+from mod_pywebsocket import handshake
+
+
+def web_socket_do_extra_handshake(request):
+  msg = ('HTTP/1.1 101 Switching Protocols\r\n'
+         'Upgrade: websocket\r\n'
+         'Connection: Upgrade\r\n'
+         'Sec-WebSocket-Accept: 3rfd')
+  request.connection.write(msg)
+  # Prevent pywebsocket from sending its own handshake message.
+  raise handshake.AbortedByUserException('Close the connection')
+
+
+def web_socket_transfer_data(request):
+  pass