Remove fixed GENERIC_FUNCTION_TYPED_PARAM_UNSUPPORTED.

Change-Id: Id5119149cf24fe748a3100b3a2b774915928ddf7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/122303
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

Author: scheglov

pkg/analyzer/lib/error/error.dart

@@ -156,7 +156,6 @@ const List<ErrorCode> errorCodeValues = const [
   CompileTimeErrorCode.FIELD_INITIALIZER_REDIRECTING_CONSTRUCTOR,
   CompileTimeErrorCode.FINAL_INITIALIZED_MULTIPLE_TIMES,
   CompileTimeErrorCode.FOR_IN_WITH_CONST_VARIABLE,
-  CompileTimeErrorCode.GENERIC_FUNCTION_TYPED_PARAM_UNSUPPORTED,
   CompileTimeErrorCode.GENERIC_FUNCTION_TYPE_CANNOT_BE_BOUND,
   CompileTimeErrorCode.GENERIC_FUNCTION_TYPE_CANNOT_BE_TYPE_ARGUMENT,
   CompileTimeErrorCode.IF_ELEMENT_CONDITION_FROM_DEFERRED_LIBRARY,

pkg/analyzer/lib/src/error/codes.dart

@@ -2008,22 +2008,6 @@ class CompileTimeErrorCode extends AnalyzerErrorCode {
           correction: "Try removing type parameters from the generic function "
               "type, or using 'dynamic' as the type argument here.");
 
-  /**
-   * Temporary error to work around dartbug.com/28515.
-   *
-   * We cannot yet properly summarize function-typed parameters with generic
-   * arguments, so to prevent confusion, we produce an error for any such
-   * constructs (regardless of whether summaries are in use).
-   *
-   * TODO(paulberry): remove this once dartbug.com/28515 is fixed.
-   */
-  static const CompileTimeErrorCode GENERIC_FUNCTION_TYPED_PARAM_UNSUPPORTED =
-      const CompileTimeErrorCode('GENERIC_FUNCTION_TYPED_PARAM_UNSUPPORTED',
-          "Analysis of generic function typed parameters isn't yet supported.",
-          correction:
-              "Try using an explicit typedef, or changing type parameters to "
-              "`dynamic`.");
-
   static const CompileTimeErrorCode IF_ELEMENT_CONDITION_FROM_DEFERRED_LIBRARY =
       const CompileTimeErrorCode(
           'IF_ELEMENT_CONDITION_FROM_DEFERRED_LIBRARY',