Clean up dart:io exceptions.

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

Index: sdk/lib/_internal/pub/lib/src/command.dart
diff --git a/sdk/lib/_internal/pub/lib/src/command.dart b/sdk/lib/_internal/pub/lib/src/command.dart
index abc2468e41e384272d55ab39d1dca46f09e7b53b..73bf471e621d26b51a38a818c90a9667c700b2c4 100644
--- a/sdk/lib/_internal/pub/lib/src/command.dart
+++ b/sdk/lib/_internal/pub/lib/src/command.dart
@@ -173,8 +173,8 @@ and include the results in a bug report on http://dartbug.com/new.
   /// Returns the appropriate exit code for [exception], falling back on 1 if no
   /// appropriate exit code could be found.
   int _chooseExitCode(exception) {
-    if (exception is HttpException || exception is HttpParserException ||
-        exception is SocketIOException || exception is PubHttpException) {
+    if (exception is HttpException || exception is HttpException ||
+        exception is SocketException || exception is PubHttpException) {
       return exit_codes.UNAVAILABLE;
     } else if (exception is FormatException) {
       return exit_codes.DATA;