Enable async support

pkg/analyzer/test/generated/resolver_test.dart

Index: pkg/analyzer/test/generated/resolver_test.dart
diff --git a/pkg/analyzer/test/generated/resolver_test.dart b/pkg/analyzer/test/generated/resolver_test.dart
index d311cc7c22e5ca0c968d1429380a0c8bdee42aa1..93ff45ee1e8734c213825c6714c98695af5538e8 100644
--- a/pkg/analyzer/test/generated/resolver_test.dart
+++ b/pkg/analyzer/test/generated/resolver_test.dart
@@ -378,7 +378,6 @@ class AnalysisContextForTests extends AnalysisContextImpl {
     bool needsRecompute =
         currentOptions.analyzeFunctionBodies != options.analyzeFunctionBodies ||
         currentOptions.generateSdkErrors != options.generateSdkErrors ||
-        currentOptions.enableAsync != options.enableAsync ||
         currentOptions.enableDeferredLoading != options.enableDeferredLoading ||
         currentOptions.enableEnum != options.enableEnum ||
         currentOptions.dart2jsHint != options.dart2jsHint ||
@@ -7830,16 +7829,6 @@ class ResolverTestCase extends EngineTestCase {
   }
 
   /**
-   * Reset the analysis context to have the 'enableAsync' option set to true.
-   */
-  void resetWithAsync() {
-    AnalysisOptionsImpl options = new AnalysisOptionsImpl();
-    options.enableAsync = true;
-    analysisContext2 =
-        AnalysisContextFactory.contextWithCoreAndOptions(options);
-  }
-
-  /**
    * Reset the analysis context to have the 'enableEnum' option set to true.
    */
   void resetWithEnum() {