GitLab

According to comment to HttpStream::ReadResponseBody() 0 means end of response
while HttpResponseBodyDrainer treated it as error.

BUG=154712
TEST=net_unittests


Review URL: https://chromiumcodereview.appspot.com/11112021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162415 0039d316-1c4b-4281-b951-d872f2087c98