Fix virtual/override/final usage in Source/core/layout/.

Source/core/layout/LayoutSearchField.h

Index: Source/core/layout/LayoutSearchField.h
diff --git a/Source/core/layout/LayoutSearchField.h b/Source/core/layout/LayoutSearchField.h
index 1dc31fdeb41066093ee8f446ea96903c1fec7125..239d100fb9cc97b4c4b002e2f2468ebc8f7d4e7d 100644
--- a/Source/core/layout/LayoutSearchField.h
+++ b/Source/core/layout/LayoutSearchField.h
@@ -32,12 +32,12 @@ class HTMLInputElement;
 class LayoutSearchField final : public LayoutTextControlSingleLine {
 public:
     LayoutSearchField(HTMLInputElement*);
-    virtual ~LayoutSearchField();
+    ~LayoutSearchField() override;
 
 private:
-    virtual void centerContainerIfNeeded(LayoutBox*) const override;
-    virtual LayoutUnit computeControlLogicalHeight(LayoutUnit lineHeight, LayoutUnit nonContentHeight) const override;
-    virtual LayoutUnit computeLogicalHeightLimit() const override;
+    void centerContainerIfNeeded(LayoutBox*) const override;
+    LayoutUnit computeControlLogicalHeight(LayoutUnit lineHeight, LayoutUnit nonContentHeight) const override;
+    LayoutUnit computeLogicalHeightLimit() const override;
 
     Element* searchDecorationElement() const;
     Element* cancelButtonElement() const;