[NaCl SDK AppEngine] Turn on https for all requests.

BUG=none
R=sbc@chromium.org

Review URL: https://codereview.chromium.org/102423006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239619 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239619