change "late" from built-in to keyword

Change-Id: I851bc1a6db305c6fa7f5be001af1632d6d69aa2a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99739
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
diff --git a/pkg/front_end/lib/src/scanner/token.dart b/pkg/front_end/lib/src/scanner/token.dart
index d131a6e..c1989c8 100644
--- a/pkg/front_end/lib/src/scanner/token.dart
+++ b/pkg/front_end/lib/src/scanner/token.dart
@@ -211,8 +211,7 @@
   static const Keyword IS =
       const Keyword("is", "IS", precedence: RELATIONAL_PRECEDENCE);
 
-  static const Keyword LATE =
-      const Keyword("late", "LATE", isBuiltIn: true, isModifier: true);
+  static const Keyword LATE = const Keyword("late", "LATE", isModifier: true);
 
   static const Keyword LIBRARY = const Keyword("library", "LIBRARY",
       isBuiltIn: true, isTopLevelKeyword: true);
diff --git a/pkg/front_end/test/token_test.dart b/pkg/front_end/test/token_test.dart
index 472d1d2..ddde7df 100644
--- a/pkg/front_end/test/token_test.dart
+++ b/pkg/front_end/test/token_test.dart
@@ -97,7 +97,6 @@
       Keyword.IMPORT,
       Keyword.INTERFACE,
       Keyword.LIBRARY,
-      Keyword.LATE,
       Keyword.MIXIN,
       Keyword.OPERATOR,
       Keyword.PART,