Deprecate topOrigin part 1: cleanup unused topOrigin params in SecurityOrigin

Also deprecates following two methods, which don't look necessary
- isThirdParty()
- canAccessStorage()

BUG=262858

Review URL: https://chromiumcodereview.appspot.com/19637011

git-svn-id: svn://svn.chromium.org/blink/trunk@154669 bbb929c8-8fbe-4397-9dbb-9b2b20218538