Bug 949132 - Use the FrameMetrics flag on the layers update to update APZC scroll offset instead of tracking it in widget code. r=Cwiiis

mobile/android/base/gfx/JavaPanZoomController.java

@@ -1457,11 +1457,6 @@ class JavaPanZoomController
         return mX.getOverScrollMode();
     }
 
-    @Override
-    public void updateScrollOffset(float cssX, float cssY) {
-        // Nothing to update, this class doesn't store the scroll offset locally.
-    }
-
     @Override
     public void setOverscrollHandler(final Overscroll handler) {
         mOverscroll = handler;