Consistently use only one of virtual/OVERRIDE/FINAL.

src/compiler/operator.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_OPERATOR_H_
 #define V8_COMPILER_OPERATOR_H_
 
 #include <ostream>  // NOLINT(readability/streams)
 
 #include "src/base/flags.h"
@@ skipping 123 matching lines @@
             size_t value_out, size_t effect_out, size_t control_out,
             T parameter, Pred const& pred = Pred(), Hash const& hash = Hash())
       : Operator(opcode, properties, mnemonic, value_in, effect_in, control_in,
                  value_out, effect_out, control_out),
         parameter_(parameter),
         pred_(pred),
         hash_(hash) {}
 
   T const& parameter() const { return parameter_; }
 
-  virtual bool Equals(const Operator* other) const FINAL {
+  bool Equals(const Operator* other) const FINAL {
     if (opcode() != other->opcode()) return false;
     const Operator1<T>* that = static_cast<const Operator1<T>*>(other);
     return this->pred_(this->parameter(), that->parameter());
   }
-  virtual size_t HashCode() const FINAL {
+  size_t HashCode() const FINAL {
     return base::hash_combine(this->opcode(), this->hash_(this->parameter()));
   }
   virtual void PrintParameter(std::ostream& os) const {
     os << "[" << this->parameter() << "]";
   }
 
  protected:
-  virtual void PrintTo(std::ostream& os) const FINAL {
+  void PrintTo(std::ostream& os) const FINAL {
     os << mnemonic();
     PrintParameter(os);
   }
 
  private:
   T const parameter_;
   Pred const pred_;
   Hash const hash_;
 };
 
 
 // Helper to extract parameters from Operator1<*> operator.
 template <typename T>
 inline T const& OpParameter(const Operator* op) {
   return static_cast<const Operator1<T>*>(op)->parameter();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPERATOR_H_