Prefix resolution_types with Resolution.

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

Index: pkg/compiler/lib/src/js_backend/backend_serialization.dart
diff --git a/pkg/compiler/lib/src/js_backend/backend_serialization.dart b/pkg/compiler/lib/src/js_backend/backend_serialization.dart
index 3b9818efa1b1fecdd753f36387ebd987c948388d..834daaea3b87b0111bfae81654913cd8dbac5485 100644
--- a/pkg/compiler/lib/src/js_backend/backend_serialization.dart
+++ b/pkg/compiler/lib/src/js_backend/backend_serialization.dart
@@ -156,7 +156,7 @@ class NativeBehaviorSerialization {
   static const int SPECIAL_TYPE = 2;
 
   static int getTypeKind(var type) {
-    if (type is DartType) {
+    if (type is ResolutionDartType) {
       // TODO(johnniwinther): Remove this when annotation are no longer resolved
       // to this-types.
       if (type is GenericType &&
@@ -169,8 +169,8 @@ class NativeBehaviorSerialization {
     return SPECIAL_TYPE;
   }
 
-  /// Returns a list of the non-this-type [DartType]s in [types].
-  static List<DartType> filterDartTypes(List types) {
+  /// Returns a list of the non-this-type [ResolutionDartType]s in [types].
+  static List<ResolutionDartType> filterDartTypes(List types) {
     return types.where((type) => getTypeKind(type) == NORMAL_TYPE).toList();
   }