Update editing classes to use OVERRIDE / FINAL when needed

Source/core/editing/SplitTextNodeContainingElementCommand.h

Index: Source/core/editing/SplitTextNodeContainingElementCommand.h
diff --git a/Source/core/editing/SplitTextNodeContainingElementCommand.h b/Source/core/editing/SplitTextNodeContainingElementCommand.h
index ba9da5b81a910ee368ff73aeaf96c6f81727d7bc..4210ac03d46001c9e431ee64ce5aeab043d38405 100644
--- a/Source/core/editing/SplitTextNodeContainingElementCommand.h
+++ b/Source/core/editing/SplitTextNodeContainingElementCommand.h
@@ -30,7 +30,7 @@
 
 namespace WebCore {
 
-class SplitTextNodeContainingElementCommand : public CompositeEditCommand {
+class SplitTextNodeContainingElementCommand FINAL : public CompositeEditCommand {
 public:
     static PassRefPtr<SplitTextNodeContainingElementCommand> create(PassRefPtr<Text> node, int offset)
     {
@@ -40,7 +40,7 @@ public:
 private:
     SplitTextNodeContainingElementCommand(PassRefPtr<Text>, int offset);
 
-    virtual void doApply();
+    virtual void doApply() OVERRIDE;
 
     RefPtr<Text> m_text;
     int m_offset;