Remove union type support from analyzer.

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 1356cc544f34460c1c13f087dfa2ebe9ba19f677..ecb784d15847e29d2a365684df7bffc2df5decc2 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -5734,17 +5734,6 @@ class AnalysisEngine {
    */
   final PartitionManager partitionManager = new PartitionManager();
 
-  /**
-   * A flag indicating whether union types should be used.
-   */
-  bool enableUnionTypes = false;
-
-  /**
-   * A flag indicating whether union types should have strict semantics. This
-   * option has no effect when `enabledUnionTypes` is `false`.
-   */
-  bool strictUnionTypes = false;
-
   AnalysisEngine._();
 
   /**