Use default-port-aware URI comparisons in pub.

utils/pub/http.dart

Index: utils/pub/http.dart
diff --git a/utils/pub/http.dart b/utils/pub/http.dart
index a12c2d0fc3e79b502176613112406c631d39eb62..b66f28d749f72b2fa79851f0ac700094b2dc429a 100644
--- a/utils/pub/http.dart
+++ b/utils/pub/http.dart
@@ -52,7 +52,8 @@ class PubHttpClient extends http.BaseClient {
       // 401 responses should be handled by the OAuth2 client. It's very
       // unlikely that they'll be returned by non-OAuth2 requests. We also want
       // to pass along 400 responses from the token endpoint.
-      var tokenRequest = streamedResponse.request.url == oauth2.tokenEndpoint;
+      var tokenRequest = urisEqual(
+          streamedResponse.request.url, oauth2.tokenEndpoint);
       if (status < 400 || status == 401 || (status == 400 && tokenRequest)) {
         return streamedResponse;
       }