Consistently use only one of virtual/OVERRIDE/FINAL.

src/ast-value-factory.h

Index: src/ast-value-factory.h
diff --git a/src/ast-value-factory.h b/src/ast-value-factory.h
index 7b82e4a13e4080a73dc01036181153f9e5599f55..a189f173b56fa2e2bf0b0a412e301441e1348721 100644
--- a/src/ast-value-factory.h
+++ b/src/ast-value-factory.h
@@ -64,13 +64,13 @@ class AstString : public ZoneObject {
 
 class AstRawString : public AstString {
  public:
-  virtual int length() const OVERRIDE {
+  int length() const OVERRIDE {
     if (is_one_byte_)
       return literal_bytes_.length();
     return literal_bytes_.length() / 2;
   }
 
-  virtual void Internalize(Isolate* isolate) OVERRIDE;
+  void Internalize(Isolate* isolate) OVERRIDE;
 
   bool AsArrayIndex(uint32_t* index) const;
 
@@ -124,11 +124,9 @@ class AstConsString : public AstString {
       : left_(left),
         right_(right) {}
 
-  virtual int length() const OVERRIDE {
-    return left_->length() + right_->length();
-  }
+  int length() const OVERRIDE { return left_->length() + right_->length(); }
 
-  virtual void Internalize(Isolate* isolate) OVERRIDE;
+  void Internalize(Isolate* isolate) OVERRIDE;
 
  private:
   friend class AstValueFactory;