Remove unused fields from analysis_server.

pkg/analysis_server/lib/src/services/generated/util.dart

Index: pkg/analysis_server/lib/src/services/generated/util.dart
diff --git a/pkg/analysis_server/lib/src/services/generated/util.dart b/pkg/analysis_server/lib/src/services/generated/util.dart
index ebd034b12f7f713c39c7427048b04b8a8c69a222..a2002f9da0e152a22070ec5cef2b6f120f8a22d4 100644
--- a/pkg/analysis_server/lib/src/services/generated/util.dart
+++ b/pkg/analysis_server/lib/src/services/generated/util.dart
@@ -114,12 +114,6 @@ class AssistContext {
  * Utilities for analyzing [CompilationUnit], its parts and source.
  */
 class CorrectionUtils {
-  /**
-   * If `true` then [addEdit] validates that
-   * [Edit] replaces correct part of the [Source].
-   */
-  static bool _DEBUG_VALIDATE_EDITS = true;
-
   static List<String> _KNOWN_METHOD_NAME_PREFIXES = ["get", "is", "to"];
 
   /**