Enable enum and deferred import support

pkg/analyzer/lib/options.dart

Index: pkg/analyzer/lib/options.dart
diff --git a/pkg/analyzer/lib/options.dart b/pkg/analyzer/lib/options.dart
index af3c712e9ac5f94c23d0cca9a2a52639ecdb56cb..33a9a1e147cc96379da10914b841c330241033d0 100644
--- a/pkg/analyzer/lib/options.dart
+++ b/pkg/analyzer/lib/options.dart
@@ -26,9 +26,6 @@ class CommandLineOptions {
   /** Whether to display version information */
   final bool displayVersion;
 
-  /** Whether to enable support for the proposed enum feature. */
-  final bool enableEnum;
-
   /**
    * Whether to treat type mismatches found during constant evaluation as
    * errors.
@@ -77,7 +74,6 @@ class CommandLineOptions {
         this.definedVariables = definedVariables,
         disableHints = args['no-hints'],
         displayVersion = args['version'],
-        enableEnum = args['enable-enum'],
         enableTypeChecks = args['enable_type_checks'],
         ignoreUnrecognizedFlags = args['ignore-unrecognized-flags'],
         log = args['log'],