Don't attempt to parse an HTTP response body on HEAD requests.

Previously if the response had a Content-Length or Transfer-Encoding
header we assumed it had a body. This was untrue of HEAD requests.
This is not a regression.

Bug: http://code.google.com/p/android/issues/detail?id=24672
Change-Id: I264db2014e681a6f8e93cd40b0f1640c95103d21
2 files changed