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

LayoutTests/fast/events/scale-and-scroll-window.html

Index: LayoutTests/fast/events/scale-and-scroll-window.html
diff --git a/LayoutTests/fast/events/scale-and-scroll-window.html b/LayoutTests/fast/events/scale-and-scroll-window.html
index 2c67664c236a64b06ca0fd35324363fc29a5005c..d563e0cb5a112ff9badef1b1249f18142c7bdb7d 100644
--- a/LayoutTests/fast/events/scale-and-scroll-window.html
+++ b/LayoutTests/fast/events/scale-and-scroll-window.html
@@ -10,7 +10,7 @@
       window.enablePixelTesting = true;
 
       function scroll() {
-          // The page scale, as set by window.internals.setPageScaleFactor should not be apparent
+          // The page scale, as set by window.eventSender.setPageScaleFactor should not be apparent
           // to javascript. So, we expect scrolling to (100,100) to be page coordinates, rather
           // than device pixels.
           window.scrollTo(100,100);
@@ -24,8 +24,9 @@
       function scaleWithEventSender() {
           var scaleFactor = 2.0;
           var scaleOffset = 0;
-          if (window.internals) {
-             window.internals.setPageScaleFactor(scaleFactor, scaleOffset, scaleOffset);
+          if (window.eventSender) {
+            eventSender.setInitialPageScaleOverride(-1);
+            eventSender.setPageScaleFactor(scaleFactor, scaleOffset, scaleOffset);
           }
       }