Revert "Add support for generic function type syntax, part 1" (TBR)

pkg/analysis_server/lib/src/computer/computer_highlights.dart

Index: pkg/analysis_server/lib/src/computer/computer_highlights.dart
diff --git a/pkg/analysis_server/lib/src/computer/computer_highlights.dart b/pkg/analysis_server/lib/src/computer/computer_highlights.dart
index 5768a885e10975cfe0237abf3f0ef86da8b28f8b..1214ea4c37701c8274b034a3ddeccf15690d1667 100644
--- a/pkg/analysis_server/lib/src/computer/computer_highlights.dart
+++ b/pkg/analysis_server/lib/src/computer/computer_highlights.dart
@@ -500,19 +500,6 @@ class _DartUnitHighlightsComputerVisitor extends RecursiveAstVisitor<Object> {
   }
 
   @override
-  Object visitGenericFunctionType(GenericFunctionType node) {
-    computer._addRegion_token(
-        node.functionKeyword, HighlightRegionType.KEYWORD);
-    return super.visitGenericFunctionType(node);
-  }
-
-  @override
-  Object visitGenericTypeAlias(GenericTypeAlias node) {
-    computer._addRegion_token(node.typedefKeyword, HighlightRegionType.KEYWORD);
-    return super.visitGenericTypeAlias(node);
-  }
-
-  @override
   Object visitHideCombinator(HideCombinator node) {
     computer._addRegion_token(node.keyword, HighlightRegionType.BUILT_IN);
     return super.visitHideCombinator(node);