Fix tests to avoid page scale reset when setting page scale.

LayoutTests/fast/events/script-tests/page-scaled-mouse-click-iframe.js

 description("This tests that page scaling and CSS transforms do not affect mouse event pageX and pageY coordinates for " +
             "content embedded in an iframe.");
 
 var html = document.documentElement;
 
 var iframe = document.createElement("iframe");
 iframe.style.border = "none";
 iframe.style.width = "200px";
 iframe.style.height = "200px";
 iframe.style.background = "green";
@@ skipping 34 matching lines @@
     shouldBeEqualToString("eventLog", expectedString);
     clearEventLog();
     debug("");
 }
 
 function iframeLoaded() {
   // Add the div to the iframe.
   div.addEventListener("click", appendEventLog, false);
   iframe.contentWindow.document.body.insertBefore(div, iframe.contentWindow.document.body.firstChild);
 
-  if (window.eventSender && window.internals) {
+  if (window.eventSender) {
     eventSender.mouseMoveTo(10, 10);
     // We are clicking in the same position on screen. As we scale or transform the page,
     // we expect the pageX and pageY event coordinates to change because different
     // parts of the document are under the mouse.
 
     testEvents(0, "Unscaled", "click(10, 10)");
 
-    window.internals.setPageScaleFactor(0.5, 0, 0);
+    window.eventSender.setPageScaleFactor(0.5, 0, 0);
     testEvents(0, "setPageScale(0.5)", "click(20, 20)");
 
-    window.internals.setPageScaleFactor(1.0, 0, 0);
+    window.eventSender.setPageScaleFactor(1.0, 0, 0);
     html.style["-webkit-transform"] = "scale(0.5, 2.0)";
     html.style["-webkit-transform-origin"] = "0 0";
     testEvents(0, "CSS scale(0.5, 2.0)", "click(20, 5)");
 
-    window.internals.setPageScaleFactor(0.5, 0, 0);
+    window.eventSender.setPageScaleFactor(0.5, 0, 0);
     testEvents(0, "setPageScale(0.5), CSS scale(0.5, 2.0)", "click(40, 10)");
   }
 
   finishJSTest();
 }
 
 // Mouse events only work after an initial layout
 document.body.offsetLeft;
 
 // Add the iframe to the document.
 iframe.src = "resources/page-scaled-mouse-click-iframe-inner.html";
 document.body.insertBefore(iframe, document.body.firstChild);
 
 window.jsTestIsAsync = true;