Update editing classes to use OVERRIDE / FINAL when needed

Source/core/editing/UnlinkCommand.h

Index: Source/core/editing/UnlinkCommand.h
diff --git a/Source/core/editing/UnlinkCommand.h b/Source/core/editing/UnlinkCommand.h
index d6b8d17bd286fdff2d4a5f207fe02147c0379386..aebc5abc4e170fb5b63fd6368ba84b3a7da0a0dd 100644
--- a/Source/core/editing/UnlinkCommand.h
+++ b/Source/core/editing/UnlinkCommand.h
@@ -30,7 +30,7 @@
 
 namespace WebCore {
 
-class UnlinkCommand : public CompositeEditCommand {
+class UnlinkCommand FINAL : public CompositeEditCommand {
 public:
     static PassRefPtr<UnlinkCommand> create(Document& document)
     {
@@ -40,8 +40,8 @@ public:
 private:
     explicit UnlinkCommand(Document&);
 
-    virtual void doApply();
-    virtual EditAction editingAction() const { return EditActionUnlink; }
+    virtual void doApply() OVERRIDE;
+    virtual EditAction editingAction() const OVERRIDE { return EditActionUnlink; }
 };
 
 } // namespace WebCore