Add NativeDataResolver

pkg/compiler/lib/src/js_backend/patch_resolver.dart

Index: pkg/compiler/lib/src/js_backend/patch_resolver.dart
diff --git a/pkg/compiler/lib/src/js_backend/patch_resolver.dart b/pkg/compiler/lib/src/js_backend/patch_resolver.dart
index fc836c379178f0b4b28fbaebc96f3daa821e4364..0dfd302191f10ccbfc9ba88b22a7cc28b9adf2f8 100644
--- a/pkg/compiler/lib/src/js_backend/patch_resolver.dart
+++ b/pkg/compiler/lib/src/js_backend/patch_resolver.dart
@@ -33,7 +33,7 @@ class PatchResolverTask extends CompilerTask {
       });
       checkMatchingPatchSignatures(element, patch);
       element = patch;
-    } else if (!compiler.backend.nativeData.isJsInterop(element)) {
+    } else {
       reporter.reportErrorMessage(
           element, MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION);
     }