Use getViewHeightWithTitle() to honor the scrollbar

setting when computing the maxScrollY for fling.
This is honored in the regular scroll in 
computeVerticalScrollExtent().

Fix http://b/issue?id=2251694

core/java/android/webkit/WebView.java

@@ -4297,7 +4297,7 @@ public class WebView extends AbsoluteLayout
 
     private int computeMaxScrollY() {
         int maxContentH = computeVerticalScrollRange() + getTitleHeight();
-        return Math.max(maxContentH - getHeight(), getTitleHeight());
+        return Math.max(maxContentH - getViewHeightWithTitle(), getTitleHeight());
     }
 
     public void flingScroll(int vx, int vy) {