HttpServer: avoid DCHECK'ing on non-HTTP/1.1 requests.

BUG=b/14249697
R=mef@chromium.org,byungchul@chromium.org

Review URL: https://codereview.chromium.org/251213004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@267066 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed