base/json: Get rid of static initializer in JSONReader.

base/json/json_reader.h

 // Copyright (c) 2011 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 175 matching lines @@
   // false.
   bool EatComment();
 
   // Checks if |json_pos_| matches str.
   bool NextStringMatch(const wchar_t* str, size_t length);
 
   // Sets the error code that will be returned to the caller. The current
   // line and column are determined and added into the final message.
   void SetErrorCode(const JsonParseError error, const wchar_t* error_pos);
 
+  const Token* kInvalidToken;
+
   // Pointer to the starting position in the input string.
   const wchar_t* start_pos_;
 
   // Pointer to the current position in the input string.
   const wchar_t* json_pos_;
 
   // Used to keep track of how many nested lists/dicts there are.
   int stack_depth_;
 
   // A parser flag that allows trailing commas in objects and arrays.
   bool allow_trailing_comma_;
 
   // Contains the error code for the last call to JsonToValue(), if any.
   JsonParseError error_code_;
   int error_line_;
   int error_col_;
 
   DISALLOW_COPY_AND_ASSIGN(JSONReader);
 };
 
 }  // namespace base
 
 #endif  // BASE_JSON_JSON_READER_H_