tests._base.html_rtl failure in scrollingQuirksIframeVertSmall on FF4, IE9

[bill]

This is from runTests.html, didn't try standalone:

 GROUP "scrollingQuirksIframeVertSmall" has 1 test to run
     _AssertFailure: http://mac/clean/dojo/_base/_loader/bootstrap.js:585 doh._AssertFailure: assertEqual() failed:
  expected EQUAL but got 100% width element start/size=17/283 frame client width=283
 doh._AssertFailure
     ERROR IN:
  (function (t) {var d = new doh.Deferred, s = document.createElement("SPAN");s.loaded = function (iframe) {iframe.resultReady = d.getTestCallback(function () {t.is("EQUAL", iframe.testResult);});iframe.runScrollingTest(iframe);};s.innerHTML = "<iframe class=\"iframeTest\" id=\"" + id + "\" src=\"scrolling" + doctype + "Iframe.html?rtl&" + scroll + "&" + size + "\" frameborder=\"0\" onload=\"this.parentNode.loaded(this)\" style=\"background-color:gray;\" allowtransparency></iframe>";dojo.byId("iframeContainer").appendChild(s);return d;})
 FAILED test: ../../dojo/tests/_base/html_rtl.html::scrollingQuirksIframeVertSmall::test_scrollingQuirksIframeVertSmall 374 ms

[Eugene Lazutkin]

Reassigning per IRC conversation.

[Douglas Hays]

(In [25689]) Fixes #12478. IE9 doesn't support fireEvent so added create/dispatchEvent instead. IE9 and FF5 both can show the avertical scrollbar on the left in quirks/rtl mode. Increased iframe test timeouts. Fixed some sniff.js return value/usage issues.

[Douglas Hays]

In [30337]:

Refs #12478. Backport [25689] to 1.6 to support IE 9/10.