Prefix resolution_types with Resolution.

pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart

Index: pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
diff --git a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
index 0f27c83460a42ac29f4441b775f03c9908b91d05..7cf3baa2797181932272c09b23eed26fa468028b 100644
--- a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
+++ b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
@@ -11,7 +11,7 @@ import '../common/names.dart' show Identifiers;
 import '../compiler.dart' show Compiler;
 import '../constants/expressions.dart' show ConstantExpression;
 import '../constants/values.dart';
-import '../elements/resolution_types.dart' show DartType;
+import '../elements/resolution_types.dart' show ResolutionDartType;
 import '../elements/elements.dart';
 import '../js_backend/js_backend.dart' show Annotations, JavaScriptBackend;
 import '../resolution/tree_elements.dart' show TreeElementMapping;
@@ -269,7 +269,8 @@ class TypeInformationSystem extends TypeSystem<TypeInformation> {
     return newType;
   }
 
-  TypeInformation narrowType(TypeInformation type, DartType annotation,
+  TypeInformation narrowType(
+      TypeInformation type, ResolutionDartType annotation,
       {bool isNullable: true}) {
     if (annotation.treatAsDynamic) return type;
     if (annotation.isVoid) return nullType;