Support metadata on patches.

pkg/compiler/lib/src/deferred_load.dart

Index: pkg/compiler/lib/src/deferred_load.dart
diff --git a/pkg/compiler/lib/src/deferred_load.dart b/pkg/compiler/lib/src/deferred_load.dart
index 378710d85f6b94ca58399d62be5a9ddd91e25323..3426d76e3b299976f02a988ace125003d9422864 100644
--- a/pkg/compiler/lib/src/deferred_load.dart
+++ b/pkg/compiler/lib/src/deferred_load.dart
@@ -532,7 +532,7 @@ class DeferredLoadTask extends CompilerTask {
       } else if (import.isDeferred) {
         result = import.prefix.toString();
       } else {
-        Link<MetadataAnnotation> metadatas = import.metadata;
+        List<MetadataAnnotation> metadatas = import.metadata;
         assert(metadatas != null);
         for (MetadataAnnotation metadata in metadatas) {
           metadata.ensureResolved(compiler);
@@ -723,7 +723,7 @@ class DeferredLoadTask extends CompilerTask {
           Import import = tag;
 
           /// Give an error if the old annotation-based syntax has been used.
-          Link<MetadataAnnotation> metadataList = import.metadata;
+          List<MetadataAnnotation> metadataList = import.metadata;
           if (metadataList != null) {
             for (MetadataAnnotation metadata in metadataList) {
               metadata.ensureResolved(compiler);