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

BUG=http://code.google.com/p/dart/issues/detail?id=10895

Review URL: https://codereview.chromium.org//16831023

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@24236 260f80e4-7a28-3924-810f-c04153c831b5

lib/src/io.dart

@@ -772,7 +772,7 @@ ByteStream createTarGz(List contents, {baseDir}) {
     // 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