replace 'virtual ... OVERRIDE' with '... override'

base/json/json_string_value_serializer.h

 // Copyright (c) 2012 The Chromium 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 BASE_JSON_JSON_STRING_VALUE_SERIALIZER_H_
 #define BASE_JSON_JSON_STRING_VALUE_SERIALIZER_H_
 
 #include <string>
 
 #include "base/base_export.h"
@@ skipping 20 matching lines @@
         initialized_with_const_string_(true),
         pretty_print_(false),
         allow_trailing_comma_(false) {
   }
 
   virtual ~JSONStringValueSerializer();
 
   // Attempt to serialize the data structure represented by Value into
   // JSON.  If the return value is true, the result will have been written
   // into the string passed into the constructor.
-  virtual bool Serialize(const base::Value& root) OVERRIDE;
+  bool Serialize(const base::Value& root) override;
 
   // Equivalent to Serialize(root) except binary values are omitted from the
   // output.
   bool SerializeAndOmitBinaryValues(const base::Value& root);
 
   // Attempt to deserialize the data structure encoded in the string passed
   // in to the constructor into a structure of Value objects.  If the return
   // value is NULL, and if |error_code| is non-null, |error_code| will
   // contain an integer error code (a JsonParseError in this case).
   // If |error_message| is non-null, it will be filled in with a formatted
   // error message including the location of the error if appropriate.
   // The caller takes ownership of the returned value.
-  virtual base::Value* Deserialize(int* error_code,
-                                   std::string* error_message) OVERRIDE;
+  base::Value* Deserialize(int* error_code,
+                           std::string* error_message) override;
 
   void set_pretty_print(bool new_value) { pretty_print_ = new_value; }
   bool pretty_print() { return pretty_print_; }
 
   void set_allow_trailing_comma(bool new_value) {
     allow_trailing_comma_ = new_value;
   }
 
  private:
   bool SerializeInternal(const base::Value& root, bool omit_binary_values);
 
   std::string* json_string_;
   bool initialized_with_const_string_;
   bool pretty_print_;  // If true, serialization will span multiple lines.
   // If true, deserialization will allow trailing commas.
   bool allow_trailing_comma_;
 
   DISALLOW_COPY_AND_ASSIGN(JSONStringValueSerializer);
 };
 
 #endif  // BASE_JSON_JSON_STRING_VALUE_SERIALIZER_H_