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

Source/core/editing/VisibleSelection.cpp

Index: Source/core/editing/VisibleSelection.cpp
diff --git a/Source/core/editing/VisibleSelection.cpp b/Source/core/editing/VisibleSelection.cpp
index 52a649e6c7de3fadedd5e7ad63c318882823ed33..5aa3afef6f200385638372ffffaea386e171b25f 100644
--- a/Source/core/editing/VisibleSelection.cpp
+++ b/Source/core/editing/VisibleSelection.cpp
@@ -137,7 +137,7 @@ VisibleSelection::~VisibleSelection()
 VisibleSelection VisibleSelection::selectionFromContentsOfNode(Node* node)
 {
     ASSERT(!editingIgnoresContent(node));
-    return VisibleSelection(firstPositionInNode(node), lastPositionInNode(node), DOWNSTREAM);
+    return VisibleSelection(firstPositionInNode(node), lastPositionInNode(node));
 }
 
 SelectionType VisibleSelection::selectionTypeInComposedTree() const