Introduce positionForPoint() in LocalFrame class as replacement of visiblePositionForPoint()

Source/core/page/DragController.cpp

Index: Source/core/page/DragController.cpp
diff --git a/Source/core/page/DragController.cpp b/Source/core/page/DragController.cpp
index cdf18316ae531ea2763829cbc36f0b5db7b6a042..0ec042d8a3677423e302f7219a8ed9cd987f109d 100644
--- a/Source/core/page/DragController.cpp
+++ b/Source/core/page/DragController.cpp
@@ -374,7 +374,7 @@ bool DragController::tryDocumentDrag(DragData* dragData, DragDestinationAction a
         }
 
         if (!m_fileInputElementUnderMouse)
-            m_page->dragCaretController().setCaretPosition(m_documentUnderMouse->frame()->visiblePositionForPoint(point));
+            m_page->dragCaretController().setCaretPosition(m_documentUnderMouse->frame()->positionForPoint(point));
 
         LocalFrame* innerFrame = element->document().frame();
         dragSession.operation = dragIsMove(innerFrame->selection(), dragData) ? DragOperationMove : DragOperationCopy;
@@ -428,7 +428,7 @@ static bool setSelectionToDragCaret(LocalFrame* frame, VisibleSelection& dragCar
 {
     frame->selection().setSelection(dragCaret);
     if (frame->selection().isNone()) {
-        dragCaret = VisibleSelection(frame->visiblePositionForPoint(point));
+        dragCaret = VisibleSelection(frame->positionForPoint(point));
         frame->selection().setSelection(dragCaret);
         range = dragCaret.toNormalizedRange();
     }