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

Source/core/html/parser/HTMLViewSourceParser.h

Index: Source/core/html/parser/HTMLViewSourceParser.h
diff --git a/Source/core/html/parser/HTMLViewSourceParser.h b/Source/core/html/parser/HTMLViewSourceParser.h
index 0f3549c3e1db311493d8d36b50a4d5427d679d77..62e6f9be36396ed3c4dc2b20fa7f6b40fb73fc71 100644
--- a/Source/core/html/parser/HTMLViewSourceParser.h
+++ b/Source/core/html/parser/HTMLViewSourceParser.h
@@ -41,15 +41,15 @@ public:
     {
         return adoptRefWillBeNoop(new HTMLViewSourceParser(document, mimeType));
     }
-    virtual ~HTMLViewSourceParser() { }
+    ~HTMLViewSourceParser() override { }
 
 private:
     HTMLViewSourceParser(HTMLViewSourceDocument&, const String& mimeType);
 
     // DocumentParser
-    virtual void insert(const SegmentedString&) override { ASSERT_NOT_REACHED(); }
-    virtual void append(const String&) override;
-    virtual void finish() override;
+    void insert(const SegmentedString&) override { ASSERT_NOT_REACHED(); }
+    void append(const String&) override;
+    void finish() override;
 
     HTMLViewSourceDocument* document() const { return static_cast<HTMLViewSourceDocument*>(DecodedDataDocumentParser::document()); }