Fix reply by email not working again

Fix reply by email not working again. This is a revert of 52daa039c058. Looks like AE had previously stopped Windows-1252 decoding which is why the earlier fix was needed. Now it looks like it does get decoded so the previous fix is backfiring.

[JohnA, 2012-10-04 05:57:15]

Here's a callstack that I see: 

UnicodeEncodeError: 
Traceback (most recent call last):
  File
"/base/python27_runtime/python27_lib/versions/third_party/django-1.3/django/core/handlers/base.py",
line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File
"/base/data/home/apps/s~chromiumcodereview-hr/r924-3ff970138a33-jam.362207875591573425/codereview/views.py",
line 747, in post_wrapper
    return func(request, *args, **kwds)
  File
"/base/data/home/apps/s~chromiumcodereview-hr/r924-3ff970138a33-jam.362207875591573425/codereview/views.py",
line 4058, in incoming_mail
    _process_incoming_mail(request.raw_post_data, recipients)
  File
"/base/data/home/apps/s~chromiumcodereview-hr/r924-3ff970138a33-jam.362207875591573425/codereview/views.py",
line 4075, in _process_incoming_mail
    decoded_subject = decode_header(subject)
  File "/base/python27_runtime/python27_dist/lib/python2.7/email/header.py",
line 73, in decode_header
    header = str(header)
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2026' in position
122: ordinal not in range(128)

[M-A, 2012-10-04 12:42:19]

I'm not 100% sure on what this code is doing but I trust you about this one.

Please commit on default, then merge on chromium branch and make it live after.
Don't forget to hg pull -u first, as it looks like you were one revision late.

lgtm