Cleanup: Better constify some strings in base.

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 40 matching lines @@
   // 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
   };
 
   // File-specific error messages that can be returned.
-  static const char* kAccessDenied;
-  static const char* kCannotReadFile;
-  static const char* kFileLocked;
-  static const char* kNoSuchFile;
+  static const char kAccessDenied[];
+  static const char kCannotReadFile[];
+  static const char kFileLocked[];
+  static const char kNoSuchFile[];
 
   // Convert an error code into an error message.  |error_code| is assumed to
   // be a JsonFileError.
   static const char* GetErrorMessageForCode(int error_code);
 
   void set_allow_trailing_comma(bool new_value) {
     allow_trailing_comma_ = new_value;
   }
 
  private:
   bool SerializeInternal(const base::Value& root, bool omit_binary_values);
 
   base::FilePath json_file_path_;
   bool allow_trailing_comma_;
 
   // 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_