Revert 243957 "Enable SDCH support over HTTPS if --enable-sdch=2..."

> Enable SDCH support over HTTPS if --enable-sdch=2 switch is present.
> 
> BUG=313716
> 
> Review URL: https://codereview.chromium.org/123383002

TBR=mef@chromium.org

Review URL: https://codereview.chromium.org/130893005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244038 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244038