Fix improper scrollTop/Left usage in LayoutTests/

LayoutTests/editing/input/resources/reveal-utilities.js

Index: LayoutTests/editing/input/resources/reveal-utilities.js
diff --git a/LayoutTests/editing/input/resources/reveal-utilities.js b/LayoutTests/editing/input/resources/reveal-utilities.js
index a2ef3667b3be094491e0b6ad46f4aa5b12859d94..c668b35e1e0087b8577e82ece7d529e60301b36b 100644
--- a/LayoutTests/editing/input/resources/reveal-utilities.js
+++ b/LayoutTests/editing/input/resources/reveal-utilities.js
@@ -73,9 +73,9 @@ function performJumpAtTheEdgeTest(useCtrlKeyModifier)
         var previousScrollTop = 0, currentScrollTop = 0;
         var jumpDetected = false;
         for (var i = 0; i < 120; ++i) {
-            previousScrollTop = document.body.scrollTop;
+            previousScrollTop = document.documentElement.scrollTop;
             eventSender.keyDown("\r", useCtrlKeyModifier ? ["ctrlKey"] : []);
-            currentScrollTop = document.body.scrollTop;
+            currentScrollTop = document.documentElement.scrollTop;
             // Smooth scrolls are allowed.
             if (Math.abs(previousScrollTop - currentScrollTop) > 24) {
                 jumpDetected = true;