Don't use " in process args in pub, after Process escape fix on Windows.

sdk/lib/_internal/pub/lib/src/io.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.
 
 /// Helper functionality to make working with IO easier.
 library pub.io;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:io';
@@ skipping 754 matching lines @@
       controller.addError(e);
       controller.close();
     });
     return new ByteStream(controller.stream);
   }
 
   withTempDir((tempDir) {
     // Create the tar file.
     var tarFile = path.join(tempDir, "intermediate.tar");
     var args = ["a", "-w$baseDir", tarFile];
-    args.addAll(contents.map((entry) => '-i!"$entry"'));
+    args.addAll(contents.map((entry) => '-i!$entry'));
 
     // We're passing 'baseDir' both as '-w' and setting it as the working
     // directory explicitly here intentionally. The former ensures that the
     // files added to the archive have the correct relative path in the archive.
     // The latter enables relative paths in the "-i" args to be resolved.
     return runProcess(pathTo7zip, args, workingDir: baseDir).then((_) {
       // GZIP it. 7zip doesn't support doing both as a single operation. Send
       // the output to stdout.
       args = ["a", "unused", "-tgzip", "-so", tarFile];
       return startProcess(pathTo7zip, args);
@@ skipping 32 matching lines @@
   const PubProcessResult(this.stdout, this.stderr, this.exitCode);
 
   bool get success => exitCode == 0;
 }
 
 /// Gets a [Uri] for [uri], which can either already be one, or be a [String].
 Uri _getUri(uri) {
   if (uri is Uri) return uri;
   return Uri.parse(uri);
 }