java2dart improvement - use field if getter/setter are trivial.

pkg/analyzer_experimental/lib/src/generated/utilities_dart.dart

Index: pkg/analyzer_experimental/lib/src/generated/utilities_dart.dart
diff --git a/pkg/analyzer_experimental/lib/src/generated/utilities_dart.dart b/pkg/analyzer_experimental/lib/src/generated/utilities_dart.dart
index 726e294f8221a21e326a8141b3516a0ccc5b4201..40fe9a4cfe96091de6336536a9bac76f35d3aa6f 100644
--- a/pkg/analyzer_experimental/lib/src/generated/utilities_dart.dart
+++ b/pkg/analyzer_experimental/lib/src/generated/utilities_dart.dart
@@ -18,7 +18,7 @@ class ParameterKind extends Enum<ParameterKind> {
   /**
    * A flag indicating whether this is an optional parameter.
    */
-  bool _isOptional2 = false;
+  bool isOptional = false;
 
   /**
    * Initialize a newly created kind with the given state.
@@ -26,13 +26,6 @@ class ParameterKind extends Enum<ParameterKind> {
    * @param isOptional `true` if this is an optional parameter
    */
   ParameterKind(String name, int ordinal, bool isOptional) : super(name, ordinal) {
-    this._isOptional2 = isOptional;
+    this.isOptional = isOptional;
   }
-
-  /**
-   * Return `true` if this is an optional parameter.
-   *
-   * @return `true` if this is an optional parameter
-   */
-  bool get isOptional => _isOptional2;
 }