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

LayoutTests/fast/events/scale-and-scroll-iframe-body.html

Index: LayoutTests/fast/events/scale-and-scroll-iframe-body.html
diff --git a/LayoutTests/fast/events/scale-and-scroll-iframe-body.html b/LayoutTests/fast/events/scale-and-scroll-iframe-body.html
index dcc703cbe57e62bc2846dea0c71ee2c73b464723..0a518c7a5f3756f6fa7fa70baf37842bdd89e9a4 100644
--- a/LayoutTests/fast/events/scale-and-scroll-iframe-body.html
+++ b/LayoutTests/fast/events/scale-and-scroll-iframe-body.html
@@ -24,8 +24,8 @@
         function scaleWithEventSender() {
             var scaleFactor = 0.5;
             var scaleOffset = 0;
-            if (window.internals) {
-                 window.internals.setPageScaleFactor(scaleFactor, scaleOffset, scaleOffset);

[jochen (gone - plz use gerrit), 2013/07/02 19:03:55]

should we delete window.internals.setPageScaleFactor entirely?

[aelias_OOO_until_Jul13, 2013/07/02 22:59:33]

Yes, I think we should converge to a single page-scale-factor-setting call in
the layout tests.  There are two for some kind of historical reason.  I think
setPageScaleFactor is a clearer name than scalePageBy so I'd rather keep that
one (or if eventSender is a better place for some reason, we can rename that one
to setPageScaleFactor).

It occurs to me me that in the long run, ideally these tests would use @viewport
(although we need to have support for that first on desktop)... cc'ing bokan@ to
keep that in mind.

+            if (window.eventSender) {
+                 eventSender.scalePageBy(scaleFactor, scaleOffset, scaleOffset);
             }
         }