Show the dependender(s) for missing packages.

sdk/lib/_internal/pub/test/unknown_source_test.dart

Index: sdk/lib/_internal/pub/test/unknown_source_test.dart
diff --git a/sdk/lib/_internal/pub/test/unknown_source_test.dart b/sdk/lib/_internal/pub/test/unknown_source_test.dart
index d1980834b19c23392ff8c21a1eaa1cd618f37222..9ecc3a9c80615a3c4a2571bda119a58888a7c1f9 100644
--- a/sdk/lib/_internal/pub/test/unknown_source_test.dart
+++ b/sdk/lib/_internal/pub/test/unknown_source_test.dart
@@ -17,7 +17,7 @@ main() {
       d.appDir({"foo": {"bad": "foo"}}).create();
 
       pubCommand(command, error:
-          "Package 'myapp' depends on 'foo' from unknown source 'bad'.");
+          'Package myapp depends on foo from unknown source "bad".');
     });
 
     integration('fails gracefully on transitive dependency from an unknown '
@@ -30,7 +30,7 @@ main() {
       d.appDir({"foo": {"path": "../foo"}}).create();
 
       pubCommand(command, error:
-          "Package 'foo' depends on 'bar' from unknown source 'bad'.");
+          'Package foo depends on bar from unknown source "bad".');
     });
 
     integration('ignores unknown source in lockfile', () {