Revert "Throw an exception when denying access to 'Frame's 'location' setter."

This reverts commit r156151. This change seems to be causing
unit test failing on Win 7 (dbg) bot.

TBR=mkwst@chromium.org

Review URL: https://codereview.chromium.org/22887017

git-svn-id: svn://svn.chromium.org/blink/trunk@156161 bbb929c8-8fbe-4397-9dbb-9b2b20218538