Remove HttpClientRequest.response, as it's identical to HttpClientRequest.done.

tests/standalone/io/http_client_request_test.dart

 // Copyright (c) 2013, 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.
 
 import "package:expect/expect.dart";
 import "dart:io";
 import "dart:isolate";
 import "dart:typeddata";
 
 void testClientRequest(void handler(request)) {
@@ skipping 17 matching lines @@
       })
       .catchError((error) {
         server.close();
         client.close();
       });
   });
 }
 
 void testResponseDone() {
   testClientRequest((request) {
-    request.close();
-    request.done.then((res1) {
-      request.response.then((res2) {
+    request.close().then((res1) {
+      request.done.then((res2) {
         Expect.equals(res1, res2);
       });
     });
-    return request.response;
+    return request.done;
   });
 }
 
 void testBadResponseAdd() {
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 0;
     request.writeBytes([0]);
     request.close();
     request.done.catchError((error) {
       port.close();
     }, test: (e) => e is HttpException);
-    return request.response;
+    return request.done;
   });
 
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 5;
     request.writeBytes([0, 0, 0]);
     request.writeBytes([0, 0, 0]);
     request.close();
     request.done.catchError((error) {
       port.close();
     }, test: (e) => e is HttpException);
-    return request.response;
+    return request.done;
   });
 
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 0;
     request.writeBytes(new Uint8List(64 * 1024));
     request.writeBytes(new Uint8List(64 * 1024));
     request.writeBytes(new Uint8List(64 * 1024));
     request.close();
     request.done.catchError((error) {
       port.close();
     }, test: (e) => e is HttpException);
-    return request.response;
+    return request.done;
   });
 }
 
 void testBadResponseClose() {
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 5;
     request.close();
     request.done.catchError((error) {
       port.close();
     }, test: (e) => e is HttpException);
-    return request.response;
+    return request.done;
   });
 
   testClientRequest((request) {
     var port = new ReceivePort();
     request.contentLength = 5;
     request.writeBytes([0]);
     request.close();
     request.done.catchError((error) {
       port.close();
     }, test: (e) => e is HttpException);
-    return request.response;
+    return request.done;
   });
 }
 
 void main() {
   testResponseDone();
   testBadResponseAdd();
   testBadResponseClose();
 }