"already called" error on chrome

[bill]

Loading test_Editor.html (or anything w/an editor) causes an "already called" error.

The problem is this code:

if(dojo.isWebKit){ // Safari seems to always append iframe with src=about:blank
	setTimeout(function(){ifr.setAttribute('src', s);},0);
}

That causes the iframe to load twice, calling onLoad() twice, which then calls onLoadDeferred.callback() (twice).

[bill]

(In [20123]) Remove overzealous dojo.isSafari --> dojo.isWebkit conversion, fixes #9908 !strict.