Revert "Fix renderer assert after autofill"

This reverts commit https://src.chromium.org/viewvc/blink?view=rev&revision=158348

This broke tabbing between controls on www.ge.com

BUG=326911
TBR=Jiang@opera.com

Review URL: https://codereview.chromium.org/113093005

git-svn-id: svn://svn.chromium.org/blink/trunk@163741 bbb929c8-8fbe-4397-9dbb-9b2b20218538