Get rid of a redundant argument DOWNSTREAM from VisbileSelection constructor call sites

Source/core/page/FocusController.cpp

Index: Source/core/page/FocusController.cpp
diff --git a/Source/core/page/FocusController.cpp b/Source/core/page/FocusController.cpp
index 37e361375100d3aa69e7d14cac68a64a2ad3e959..14d15afce87fb77631c57e3160c9b58111bd168a 100644
--- a/Source/core/page/FocusController.cpp
+++ b/Source/core/page/FocusController.cpp
@@ -746,7 +746,7 @@ bool FocusController::advanceFocusInDocumentOrder(WebFocusType type, bool initia
 
     if (caretBrowsing) {
         Position position = firstPositionInOrBeforeNode(element.get());
-        VisibleSelection newSelection(position, position, DOWNSTREAM);
+        VisibleSelection newSelection(position, position);
         frame->selection().setSelection(newSelection);
     }