Fix ALL the pub tests.

utils/pub/pub.dart

Index: utils/pub/pub.dart
diff --git a/utils/pub/pub.dart b/utils/pub/pub.dart
index 1a8642e7bdb7e46b7bca758c0c636784d87576c3..157b6805154c42543d6c19ad7db9b2ece5c49250 100644
--- a/utils/pub/pub.dart
+++ b/utils/pub/pub.dart
@@ -261,8 +261,8 @@ abstract class PubCommand {
 
     future
       .then((_) => cache_.deleteTempDir())
-      .catchError((error) {
-        var e = error.error;
+      .catchError((asyncError) {
+        var e = getRealError(asyncError);
         if (e is PubspecNotFoundException && e.name == null) {
           e = 'Could not find a file named "pubspec.yaml" in the directory '
             '${path.current}.';
@@ -271,7 +271,7 @@ abstract class PubCommand {
             '${basename(path.current)}").';
         }
 
-        handleError(e, error.stackTrace);
+        handleError(e, getRealStackTrace(asyncError));
       })
       // Explicitly exit on success to ensure that any dangling dart:io handles
       // don't cause the process to never terminate.