Remove outdated comment

A comment about a possible relaxation of how bytes URLs are treated
in Python 3.3 is no longer relevant or useful. Remove it.

Lib/urllib/parse.py

@@ -97,11 +97,6 @@ def clear_cache():
     _byte_quoter_factory.cache_clear()
 
 # Helpers for bytes handling
-# For 3.2, we deliberately require applications that
-# handle improperly quoted URLs to do their own
-# decoding and encoding. If valid use cases are
-# presented, we may relax this by using latin-1
-# decoding internally for 3.3
 _implicit_encoding = 'ascii'
 _implicit_errors = 'strict'