Cleanup some unused constants.

Author: Lukasa

hyper/http20/stream.py

@@ -13,26 +13,13 @@
 Each stream is identified by a monotonically increasing integer, assigned to
 the stream by the endpoint that initiated the stream.
 """
-from h2.exceptions import StreamClosedError
-
 from ..common.headers import HTTPHeaderMap
-from .exceptions import ProtocolError, StreamResetError
+from .exceptions import StreamResetError
 from .util import h2_safe_headers
-import collections
 import logging
-import zlib
 
 log = logging.getLogger(__name__)
 
-
-# Define a set of states for a HTTP/2 stream.
-STATE_IDLE               = 0
-STATE_OPEN               = 1
-STATE_HALF_CLOSED_LOCAL  = 2
-STATE_HALF_CLOSED_REMOTE = 3
-STATE_CLOSED             = 4
-
-
 # Define the largest chunk of data we'll send in one go. Realistically, we
 # should take the MSS into account but that's pretty dull, so let's just say
 # 1kB and call it a day.