Update most LayoutTests to be agnostic to scrollTopLeftInterop mode

LayoutTests/fast/events/scroll-in-scaled-page-with-overflow-hidden.html

Index: LayoutTests/fast/events/scroll-in-scaled-page-with-overflow-hidden.html
diff --git a/LayoutTests/fast/events/scroll-in-scaled-page-with-overflow-hidden.html b/LayoutTests/fast/events/scroll-in-scaled-page-with-overflow-hidden.html
index 3266828409c002fb015e1c385cef651705d44048..b8ae5b8636c3c56098916dd75675d6c7fc57b8c0 100644
--- a/LayoutTests/fast/events/scroll-in-scaled-page-with-overflow-hidden.html
+++ b/LayoutTests/fast/events/scroll-in-scaled-page-with-overflow-hidden.html
@@ -26,13 +26,16 @@
         if (window.eventSender)
             window.eventSender.setPageScaleFactor(2, 0, 0);
 
-        shouldBe("window.document.body.scrollTop", "0");
+        // Note that with ScrollTopLeftInterop enabled, document.scrollingElement is
+        // null because body is potentially scrollable (with overflow:hidden the 
+        // box can still be scrolled progamatically).

[tdresser, 2015/05/19 13:53:11]

progamatically -> programmatically 
body -> document.body

[Rick Byers, 2015/05/20 15:10:24]

Done.

+        shouldBe("window.scrollY", "0");
 
         if (window.eventSender) {
             eventSender.mouseMoveTo(100, 100);
             eventSender.mouseScrollBy(0, -5);
         }
 
-        shouldBe("window.document.body.scrollTop", "200");
+        shouldBe("window.scrollY", "200");
     })();
 </script>