Address reliance on default constructors in the javax.swing.plaf.metal APIs

Several hundred classes in the java.desktop module reply on default constructors as part of their public API.
This is for javax.swing.plaf.metal APIs

Default ctor on javax.swing.plaf.metal.MetalBorders
Default ctor on javax.swing.plaf.metal.MetalBorders.ButtonBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.Flush3DBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.InternalFrameBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.MenuBarBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.MenuItemBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.OptionDialogBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.PaletteBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.PopupMenuBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.RolloverButtonBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.ScrollPaneBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.TableHeaderBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.TextFieldBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.ToggleButtonBorder
Default ctor on javax.swing.plaf.metal.MetalBorders.ToolBarBorder
Default ctor on javax.swing.plaf.metal.MetalButtonUI
Default ctor on javax.swing.plaf.metal.MetalCheckBoxIcon
Default ctor on javax.swing.plaf.metal.MetalCheckBoxUI
Default ctor on javax.swing.plaf.metal.MetalComboBoxEditor.UIResource
Default ctor on javax.swing.plaf.metal.MetalComboBoxIcon
Default ctor on javax.swing.plaf.metal.MetalComboBoxUI
Default ctor on javax.swing.plaf.metal.MetalComboBoxUI.MetalComboBoxLayoutManager
Default ctor on javax.swing.plaf.metal.MetalComboBoxUI.MetalPropertyChangeListener
Default ctor on javax.swing.plaf.metal.MetalFileChooserUI.FilterComboBoxRenderer
Default ctor on javax.swing.plaf.metal.MetalIconFactory
Default ctor on javax.swing.plaf.metal.MetalIconFactory.FileIcon16
Default ctor on javax.swing.plaf.metal.MetalIconFactory.FolderIcon16
Default ctor on javax.swing.plaf.metal.MetalIconFactory.PaletteCloseIcon
Default ctor on javax.swing.plaf.metal.MetalIconFactory.TreeFolderIcon
Default ctor on javax.swing.plaf.metal.MetalIconFactory.TreeLeafIcon
Default ctor on javax.swing.plaf.metal.MetalLabelUI
Default ctor on javax.swing.plaf.metal.MetalLookAndFeel
Default ctor on javax.swing.plaf.metal.MetalMenuBarUI
Default ctor on javax.swing.plaf.metal.MetalPopupMenuSeparatorUI
Default ctor on javax.swing.plaf.metal.MetalProgressBarUI
Default ctor on javax.swing.plaf.metal.MetalRadioButtonUI
Default ctor on javax.swing.plaf.metal.MetalRootPaneUI
Default ctor on javax.swing.plaf.metal.MetalScrollBarUI
Default ctor on javax.swing.plaf.metal.MetalScrollPaneUI
Default ctor on javax.swing.plaf.metal.MetalSeparatorUI
Default ctor on javax.swing.plaf.metal.MetalSplitPaneUI
Default ctor on javax.swing.plaf.metal.MetalTabbedPaneUI
Default ctor on javax.swing.plaf.metal.MetalTextFieldUI
Default ctor on javax.swing.plaf.metal.MetalTheme
Default ctor on javax.swing.plaf.metal.MetalToggleButtonUI