Set the minimum fling to the title height.

Dragging and flinging have different minimums for the max Y
value. Allow the fling to have the title height instead of zero
for the minimum max Y so the title can always be removed via
fling.

This fixes http://b/issue?id=2109006

core/java/android/webkit/WebView.java

@@ -4570,7 +4570,7 @@ public class WebView extends AbsoluteLayout
 
     private int computeMaxScrollY() {
         int maxContentH = computeVerticalScrollRange() + getTitleHeight();
-        return Math.max(maxContentH - getHeight(), 0);
+        return Math.max(maxContentH - getHeight(), getTitleHeight());
     }
 
     public void flingScroll(int vx, int vy) {