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

sdk/lib/_internal/pub/lib/src/io.dart

Index: sdk/lib/_internal/pub/lib/src/io.dart
diff --git a/sdk/lib/_internal/pub/lib/src/io.dart b/sdk/lib/_internal/pub/lib/src/io.dart
index 8b6c7fdd760595beba2ed3da4515ef87281aa391..193bc4a8f28a5413040416eb451723704a65704f 100644
--- a/sdk/lib/_internal/pub/lib/src/io.dart
+++ b/sdk/lib/_internal/pub/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