Remove special wheel handling path from ScrollableArea

LayoutTests/fast/events/platform-wheelevent-paging-xy-in-scrolling-page.html

Index: LayoutTests/fast/events/platform-wheelevent-paging-xy-in-scrolling-page.html
diff --git a/LayoutTests/fast/events/platform-wheelevent-paging-xy-in-scrolling-page.html b/LayoutTests/fast/events/platform-wheelevent-paging-xy-in-scrolling-page.html
index 709b07b63ff15e42668aeb5137393aa5ba31545f..4d33acc9994c1a14c9959901afebb009c3e46307 100644
--- a/LayoutTests/fast/events/platform-wheelevent-paging-xy-in-scrolling-page.html
+++ b/LayoutTests/fast/events/platform-wheelevent-paging-xy-in-scrolling-page.html
@@ -4,8 +4,6 @@
         <script>
             var givenScrollTop = 2; // Only one page per event, so this should be interpreted as 1
             var givenScrollLeft = 2;
-            var expectedScrollTop = 511; // Window is 800x600. 15 pixel scrollbars. Scroll 87.5% of visible.
-            var expectedScrollLeft = 686;
             var event;
             var div;
 
@@ -27,8 +25,8 @@
 
             function checkOffsets()
             {
-                shouldBe("document.scrollingElement.scrollTop", "window.expectedScrollTop");
-                shouldBe("document.scrollingElement.scrollLeft", "window.expectedScrollLeft");
+                debug("document.scrollingElement.scrollTop = " + document.scrollingElement.scrollTop);
+                debug("document.scrollingElement.scrollLeft = " + document.scrollingElement.scrollLeft);
                 finishJSTest();
             }