Update editing classes to use OVERRIDE / FINAL when needed

Source/core/editing/BreakBlockquoteCommand.h

Index: Source/core/editing/BreakBlockquoteCommand.h
diff --git a/Source/core/editing/BreakBlockquoteCommand.h b/Source/core/editing/BreakBlockquoteCommand.h
index 359777c82656cb3f03e3dec86d63d4a60d746463..967870461fd1e688cd212c1c5dd00305f5019024 100644
--- a/Source/core/editing/BreakBlockquoteCommand.h
+++ b/Source/core/editing/BreakBlockquoteCommand.h
@@ -30,7 +30,7 @@
 
 namespace WebCore {
 
-class BreakBlockquoteCommand : public CompositeEditCommand {
+class BreakBlockquoteCommand FINAL : public CompositeEditCommand {
 public:
     static PassRefPtr<BreakBlockquoteCommand> create(Document& document)
     {
@@ -39,7 +39,7 @@ public:
 
 private:
     explicit BreakBlockquoteCommand(Document&);
-    virtual void doApply();
+    virtual void doApply() OVERRIDE;
 };
 
 } // namespace WebCore