Consistently use only one of virtual/OVERRIDE/FINAL.

src/bootstrapper.h

 // Copyright 2014 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_BOOTSTRAPPER_H_
 #define V8_BOOTSTRAPPER_H_
 
 #include "src/factory.h"
 
 namespace v8 {
@@ skipping 140 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(BootstrapperActive);
 };
 
 
 class NativesExternalStringResource FINAL
     : public v8::String::ExternalOneByteStringResource {
  public:
   NativesExternalStringResource(Bootstrapper* bootstrapper,
                                 const char* source,
                                 size_t length);
-  virtual const char* data() const OVERRIDE { return data_; }
-  virtual size_t length() const OVERRIDE { return length_; }
+  const char* data() const OVERRIDE { return data_; }
+  size_t length() const OVERRIDE { return length_; }
 
  private:
   const char* data_;
   size_t length_;
 };
 
 }}  // namespace v8::internal
 
 #endif  // V8_BOOTSTRAPPER_H_