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

Source/core/layout/LayoutObject.cpp

Index: Source/core/layout/LayoutObject.cpp
diff --git a/Source/core/layout/LayoutObject.cpp b/Source/core/layout/LayoutObject.cpp
index 0892709745635288d2a7b1efe0030c0615333d8e..7e558666a6c01aa21c7a0872a56b23c247aac1b7 100644
--- a/Source/core/layout/LayoutObject.cpp
+++ b/Source/core/layout/LayoutObject.cpp
@@ -3013,7 +3013,7 @@ PositionWithAffinity LayoutObject::createPositionWithAffinity(int offset, EAffin
         // Find non-anonymous content after.
         for (LayoutObject* layoutObject = child->nextInPreOrder(parent); layoutObject; layoutObject = layoutObject->nextInPreOrder(parent)) {
             if (Node* node = layoutObject->nonPseudoNode())
-                return PositionWithAffinity(firstPositionInOrBeforeNode(node), DOWNSTREAM);
+                return PositionWithAffinity(firstPositionInOrBeforeNode(node));
         }
 
         // Find non-anonymous content before.
@@ -3021,12 +3021,12 @@ PositionWithAffinity LayoutObject::createPositionWithAffinity(int offset, EAffin
             if (layoutObject == parent)
                 break;
             if (Node* node = layoutObject->nonPseudoNode())
-                return PositionWithAffinity(lastPositionInOrAfterNode(node), DOWNSTREAM);
+                return PositionWithAffinity(lastPositionInOrAfterNode(node));
         }
 
         // Use the parent itself unless it too is anonymous.
         if (Node* node = parent->nonPseudoNode())
-            return PositionWithAffinity(firstPositionInOrBeforeNode(node), DOWNSTREAM);
+            return PositionWithAffinity(firstPositionInOrBeforeNode(node));
 
         // Repeat at the next level up.
         child = parent;