Move parseInt parseDouble to int/double classes as a static method.

lib/json/json.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library("dart:json");
 
 #import('dart:math');
 
 // JSON parsing and serialization.
 
@@ skipping 313 matching lines @@
             break;
           case CHAR_T:
             c = TAB;
             break;
           case CHAR_U:
             if (position + 5 > length) {
               error('Invalid unicode esacape sequence');
             }
             final codeString = json.substring(position + 1, position + 5);
             try {
-              c = parseInt('0x${codeString}');
+              c = int.parse('0x${codeString}');
             } catch (e) {
               error('Invalid unicode esacape sequence');
             }
             position += 4;
             break;
           default:
             error('Invalid esacape sequence in string literal');
         }
       }
       charCodes.add(c);
@@ skipping 37 matching lines @@
         char = nextChar();
         isInt = false;
         while (isDigit(char)) char = nextChar();
       } else {
         error('Expected digit following \'e\' or \'E\'');
       }
     }
 
     String number = json.substring(startPos, position);
     if (isInt) {
-      return parseInt(number);
+      return int.parse(number);
     } else {
-      return parseDouble(number);
+      return double.parse(number);
     }
   }
 
   bool isChar(int char) {
     if (position >= length) return false;
     return json.charCodeAt(position) == char;
   }
 
   bool isDigit(int char) {
     return char >= CHAR_0 && char <= CHAR_9;
@@ skipping 188 matching lines @@
         first = false;
       });
       sb.add('}');
       seen.removeLast();
       return true;
     } else {
       return false;
     }
   }
 }