http/tests/history/back-to-javascript-url-iframe.html marked as Crash in Debug

TBR=japhet
BUG=

Review URL: https://codereview.chromium.org/25443012

git-svn-id: svn://svn.chromium.org/blink/trunk@158744 bbb929c8-8fbe-4397-9dbb-9b2b20218538