Fix virtual/override/final usage in Source/web/.

Source/web/WebFileChooserCompletionImpl.h

Index: Source/web/WebFileChooserCompletionImpl.h
diff --git a/Source/web/WebFileChooserCompletionImpl.h b/Source/web/WebFileChooserCompletionImpl.h
index 411365f29183b9a8443cc336f5a751d5b9271e5e..ef1c4ed1a1144232b71190e4309a290ef852f90a 100644
--- a/Source/web/WebFileChooserCompletionImpl.h
+++ b/Source/web/WebFileChooserCompletionImpl.h
@@ -42,9 +42,9 @@ namespace blink {
 class WebFileChooserCompletionImpl final : public WebFileChooserCompletion {
 public:
     explicit WebFileChooserCompletionImpl(PassRefPtr<FileChooser>);
-    virtual ~WebFileChooserCompletionImpl();
-    virtual void didChooseFile(const WebVector<WebString>& fileNames) override;
-    virtual void didChooseFile(const WebVector<SelectedFileInfo>& files) override;
+    ~WebFileChooserCompletionImpl() override;
+    void didChooseFile(const WebVector<WebString>& fileNames) override;
+    void didChooseFile(const WebVector<SelectedFileInfo>& files) override;
 
 private:
     RefPtr<FileChooser> m_fileChooser;