Fixes input tag issue in webkit-focus-workaround.

The focus workaround built for webkit browsers seems to be weird when the focusout was triggered by clicking  on an outer input element.

**Reproduction steps** (chrome 38) for the demo site hosted on http://textangular.com/:  

    // create a dummy input
    input = document.createElement('input');
    // add it to the document
    document.body.appendChild(input);

Now click inside the editor / type something, then click inside the created dummy input element.

**The caret disappears and if you start to type, you can enter only one character.**

Kind of a weird bug, looked up the tests, but couldn't found the right place for this. PhantomJS is webkit AFAIK, however I'm not sure how/where could I make a failing test for this. If you give me some tipps, I can try to add a failing-before/passing-after test for this fix.