Don't allow packages to depend on themselves.

sdk/lib/_internal/pub/test/validator/dependency_test.dart

Index: sdk/lib/_internal/pub/test/validator/dependency_test.dart
diff --git a/sdk/lib/_internal/pub/test/validator/dependency_test.dart b/sdk/lib/_internal/pub/test/validator/dependency_test.dart
index ee38ee8ba3fe66541c2d4cec002cfac5776473d1..ba29373aa83305e7521a21c73c533839b2097248 100644
--- a/sdk/lib/_internal/pub/test/validator/dependency_test.dart
+++ b/sdk/lib/_internal/pub/test/validator/dependency_test.dart
@@ -237,15 +237,5 @@ main() {
         });
       });
     });
-
-    integration('has a hosted dependency on itself', () {
-      d.dir(appPath, [
-        d.libPubspec("test_pkg", "1.0.0", deps: {
-          "test_pkg": ">=1.0.0"
-        })
-      ]).create();
-
-      expectValidationWarning(dependency);
-    });
   });
 }