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

base/json/json_file_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_FILE_VALUE_SERIALIZER_H_
 #define BASE_JSON_JSON_FILE_VALUE_SERIALIZER_H_
 
 #include <string>
 
 #include "base/base_export.h"
@@ skipping 14 matching lines @@
   virtual ~JSONFileValueSerializer() {}
 
   // DO NOT USE except in unit tests to verify the file was written properly.
   // We should never serialize directly to a file since this will block the
   // thread. Instead, serialize to a string and write to the file you want on
   // the file thread.
   //
   // 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 file whose name was 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 file 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 (either JsonFileError or JsonParseError).
   // 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;
 
   // This enum is designed to safely overlap with JSONReader::JsonParseError.
   enum JsonFileError {
     JSON_NO_ERROR = 0,
     JSON_ACCESS_DENIED = 1000,
     JSON_CANNOT_READ_FILE,
     JSON_FILE_LOCKED,
     JSON_NO_SUCH_FILE
   };
 
@@ skipping 19 matching lines @@
 
   // A wrapper for ReadFileToString which returns a non-zero JsonFileError if
   // there were file errors.
   int ReadFileToString(std::string* json_string);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSONFileValueSerializer);
 };
 
 #endif  // BASE_JSON_JSON_FILE_VALUE_SERIALIZER_H_