Take care of a FIXME in SecurityOrigin.cpp to check the validity of any innerURL during construction and to handle invalidity as a 'unique' origin.

      TBR=mkwst
BUG=514076

Review URL: https://codereview.chromium.org/1294933004

git-svn-id: svn://svn.chromium.org/blink/trunk@201022 bbb929c8-8fbe-4397-9dbb-9b2b20218538