Cleanup: Better constify some strings in base.

base/json/json_reader.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.
 //
 // A JSON parser.  Converts strings of JSON into a Value object (see
 // base/values.h).
 // http://www.ietf.org/rfc/rfc4627.txt?number=4627
 //
 // Known limitations/deviations from the RFC:
 // - Only knows how to parse ints within the range of a signed 32 bit int and
@@ skipping 57 matching lines @@
     JSON_UNEXPECTED_TOKEN,
     JSON_TRAILING_COMMA,
     JSON_TOO_MUCH_NESTING,
     JSON_UNEXPECTED_DATA_AFTER_ROOT,
     JSON_UNSUPPORTED_ENCODING,
     JSON_UNQUOTED_DICTIONARY_KEY,
     JSON_PARSE_ERROR_COUNT
   };
 
   // String versions of parse error codes.
-  static const char* kInvalidEscape;
-  static const char* kSyntaxError;
-  static const char* kUnexpectedToken;
-  static const char* kTrailingComma;
-  static const char* kTooMuchNesting;
-  static const char* kUnexpectedDataAfterRoot;
-  static const char* kUnsupportedEncoding;
-  static const char* kUnquotedDictionaryKey;
+  static const char kInvalidEscape[];
+  static const char kSyntaxError[];
+  static const char kUnexpectedToken[];
+  static const char kTrailingComma[];
+  static const char kTooMuchNesting[];
+  static const char kUnexpectedDataAfterRoot[];
+  static const char kUnsupportedEncoding[];
+  static const char kUnquotedDictionaryKey[];
 
   // Constructs a reader with the default options, JSON_PARSE_RFC.
   JSONReader();
 
   // Constructs a reader with custom options.
   explicit JSONReader(int options);
 
   ~JSONReader();
 
   // Reads and parses |json|, returning a Value. The caller owns the returned
@@ skipping 29 matching lines @@
   // numbers if appropriate.
   std::string GetErrorMessage() const;
 
  private:
   scoped_ptr<internal::JSONParser> parser_;
 };
 
 }  // namespace base
 
 #endif  // BASE_JSON_JSON_READER_H_