Revert 191807 &quotSupress script during parser adjusting DOM node l...&quot

      Reverting on trunk to avoid crashes while a fix is landed

BUG=471599

> Supress script during parser adjusting DOM node location
> 
> This attack uses HTML parser's tree tweaking operation to trigger
> a script execution. This CL supresses it. This should be acceptable
> because:
> 
>  * It never happens with well-formed markup.
>  * It only happens to a node being a child of <script>, which is unusual.
> 
> BUG=464552
> TEST=parser-adjust-parent-crash.html
> R=haraken@chromium.org
> 
> Review URL: https://codereview.chromium.org/1007523003

TBR=morrita@chromium.org

Review URL: https://codereview.chromium.org/1096553003

git-svn-id: svn://svn.chromium.org/blink/trunk@193901 bbb929c8-8fbe-4397-9dbb-9b2b20218538