[CodeHealth] Use Position::anchorNode instead of deprecatedNode.

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 810b716a4c2ce463eaccc2eb3123e8c77c1a75f9..c9da3f80778f8b96649687d0561c3aef0015c0c6 100644
--- a/Source/core/page/FocusController.cpp
+++ b/Source/core/page/FocusController.cpp
@@ -688,7 +688,7 @@ bool FocusController::advanceFocusInDocumentOrder(WebFocusType type, bool initia
     bool caretBrowsing = frame->settings() && frame->settings()->caretBrowsingEnabled();
 
     if (caretBrowsing && !currentNode)
-        currentNode = frame->selection().start().deprecatedNode();
+        currentNode = frame->selection().start().anchorNode();
 
     document->updateLayoutIgnorePendingStylesheets();
 
@@ -783,7 +783,7 @@ static void clearSelectionIfNeeded(LocalFrame* oldFocusedFrame, LocalFrame* newF
     if (caretBrowsing)
         return;
 
-    Node* selectionStartNode = selection.selection().start().deprecatedNode();
+    Node* selectionStartNode = selection.selection().start().anchorNode();
     if (selectionStartNode == newFocusedElement || selectionStartNode->isDescendantOf(newFocusedElement))
         return;