[Fetch API] Put body members directly on Response/Request

LayoutTests/http/tests/serviceworker/resources/request-worker.js

 importScripts('worker-test-harness.js');
 importScripts('test-helpers.js');
 
 var URL = 'https://www.example.com/test.html';
 
 test(function() {
     var headers = new Headers;
     headers.set('User-Agent', 'Mozilla/5.0');
     headers.set('Accept', 'text/html');
     headers.set('X-ServiceWorker-Test', 'request test field');
@@ skipping 285 matching lines @@
       };
     var request =
       new Request(URL,
                   {
                     method: 'POST',
                     body: new Blob(['Test Blob'], {type: 'test/type'})
                   });
     assert_equals(
       getContentType(request.headers), 'test/type',
       'ContentType header of Request created with Blob body must be set.');
-    request.body.asText()
+    request.text()
       .then(function(result) {
           assert_equals(result, 'Test Blob',
                         'Creating a Request with Blob body should success.');
 
           request = new Request(URL, {method: 'POST', body: 'Test String'});
           assert_equals(
             getContentType(request.headers), 'text/plain;charset=UTF-8',
             'ContentType header of Request created with string must be set.');
-          return request.body.asText();
+          return request.text();
         })
       .then(function(result) {
           assert_equals(result, 'Test String',
                         'Creating a Request with string body should success.');
 
           var text = "Test ArrayBuffer";
           var array = new Uint8Array(text.length);
           for (var i = 0; i < text.length; ++i)
             array[i] = text.charCodeAt(i);
           request = new Request(URL, {method: 'POST', body: array.buffer});
-          return request.body.asText();
+          return request.text();
         })
       .then(function(result) {
           assert_equals(
             result, 'Test ArrayBuffer',
             'Creating a Request with ArrayBuffer body should success.');
 
           var text = "Test ArrayBufferView";
           var array = new Uint8Array(text.length);
           for (var i = 0; i < text.length; ++i)
             array[i] = text.charCodeAt(i);
           request = new Request(URL, {method: 'POST', body: array});
-          return request.body.asText();
+          return request.text();
         })
       .then(function(result) {
           assert_equals(
             result, 'Test ArrayBufferView',
             'Creating a Request with ArrayBuffer body should success.');
 
           var formData = new FormData();
           formData.append('sample string', '1234567890');
           formData.append('sample blob', new Blob(['blob content']));
           formData.append('sample file',
                           new File(['file content'], 'file.dat'));
           request = new Request(URL, {method: 'POST', body: formData});
-          return request.body.asText();
+          return request.text();
         })
       .then(function(result) {
           var reg = new RegExp('multipart\/form-data; boundary=(.*)');
           var regResult = reg.exec(getContentType(request.headers));
           var boundary = regResult[1];
           var expected_body =
             '--' + boundary + '\r\n' +
             'Content-Disposition: form-data; name="sample string"\r\n' +
             '\r\n' +
             '1234567890\r\n' +
@@ skipping 12 matching lines @@
             '--' + boundary + '--\r\n';
           assert_equals(
             result, expected_body,
             'Creating a Request with FormData body should success.');
         })
       .then(function() {
           t.done();
         })
       .catch(unreached_rejection(t));
   }, 'Request body test in ServiceWorkerGlobalScope');