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The DCHECK dereferenced the request's HttpResponseInfo.  It turns out
that when an HttpNetworkTransaction is cancelled and an
HttpResponseDrainer is used, the HttpResponseInfo is deleted with the
HttpStreamParser's knowledge.

This CL also adds a pair of tests for the situation.

BUG=368418

Review URL: https://codereview.chromium.org/284913003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271014 0039d316-1c4b-4281-b951-d872f2087c98