Throw 'SecurityError' when blocking cross-origin access to frameElement and contentDocument.

This change brings us into line with Gecko by throwing SecurityError
when blocking cross-origin access in methods and attributes flagged as
'CheckSecurityForNodes'. This includes 'window.frameElement', and the
various incarnations of 'contentDocument' (and 'getSVGDocument()').

BUG=17325

Review URL: https://codereview.chromium.org/26248002

git-svn-id: svn://svn.chromium.org/blink/trunk@159114 bbb929c8-8fbe-4397-9dbb-9b2b20218538