Fix virtual/override/final usage in Source/core/dom/.

Source/core/dom/RawDataDocumentParser.h

Index: Source/core/dom/RawDataDocumentParser.h
diff --git a/Source/core/dom/RawDataDocumentParser.h b/Source/core/dom/RawDataDocumentParser.h
index d1a0331c4d08def67f274431c1a2e0a846571582..6f7c7edf1119ab023b028516bd9b0092513fa11f 100644
--- a/Source/core/dom/RawDataDocumentParser.h
+++ b/Source/core/dom/RawDataDocumentParser.h
@@ -38,24 +38,24 @@ protected:
     {
     }
 
-    virtual void finish() override
+    void finish() override
     {
         if (!isStopped())
             document()->finishedParsing();
     }
 
 private:
-    virtual void flush() override
+    void flush() override
     {
         // Make sure appendBytes is called at least once.
         appendBytes(0, 0);
     }
 
-    virtual void insert(const SegmentedString&) override
+    void insert(const SegmentedString&) override
     {
     }
 
-    virtual void append(const String&) override
+    void append(const String&) override
     {
         ASSERT_NOT_REACHED();
     }