Work around issue 7218 in Pub.

utils/pub/curl_client.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 curl_client;
 
 import 'dart:io';
 
 import '../../pkg/http/lib/http.dart' as http;
 import 'io.dart';
@@ skipping 17 matching lines @@
   CurlClient([String executable])
     : executable = executable == null ? _defaultExecutable : executable;
 
   /// Sends a request via `curl` and returns the response.
   Future<http.StreamedResponse> send(http.BaseRequest request) {
     var requestStream = request.finalize();
     return withTempDir((tempDir) {
       var headerFile = new Path(tempDir).append("curl-headers").toNativePath();
       var arguments = _argumentsForRequest(request, headerFile);
       var process;
-      return Process.start(executable, arguments).chain((process_) {
+      return startProcess(executable, arguments).chain((process_) {
         process = process_;
         if (requestStream.closed) {
           process.stdin.close();
         } else {
           requestStream.pipe(process.stdin);
         }
 
         return _waitForHeaders(process, expectBody: request.method != "HEAD");
       }).chain((_) => new File(headerFile).readAsLines())
         .transform((lines) => _buildResponse(request, process, lines));
@@ skipping 137 matching lines @@
   /// path to the bundled `curl.exe`; elsewhere, this is just "curl", and we
   /// assume it to be installed and on the user's PATH.
   static String get _defaultExecutable {
     if (Platform.operatingSystem != 'windows') return 'curl';
     // Note: This line of code gets munged by create_sdk.py to be the correct
     // relative path to curl in the SDK.
     var pathToCurl = "../../third_party/curl/curl.exe";
     return relativeToPub(pathToCurl);
   }
 }