[Payments] Move Payment Request test files to chrome/test/data/payments

chrome/test/data/payments/free_shipping.js

 /*
  * Copyright 2016 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.
  */
 
 /* global PaymentRequest:false */
 /* global toDictionary:false */
 /* global print:false */
 
@@ skipping 37 matching lines @@
                 print(error);
               });
         })
         .catch(function(error) {
           print(error);
         });
   } catch (error) {
     print(error.message);
   }
 }