Change remaining "final" to "const" in language/const_syntax_test.

lib/compiler/implementation/enqueue.dart

Index: lib/compiler/implementation/enqueue.dart
diff --git a/lib/compiler/implementation/enqueue.dart b/lib/compiler/implementation/enqueue.dart
index 01c89e456aee25f16d35b08a46c1ba77b5b15660..e4dfc8d7ff32d979c5367fc3c980676b51b5b72e 100644
--- a/lib/compiler/implementation/enqueue.dart
+++ b/lib/compiler/implementation/enqueue.dart
@@ -168,14 +168,14 @@ class Enqueuer {
     if (member.kind === ElementKind.FIELD) {
       universe.instantiatedClassInstanceFields.add(member.name);
       if (compiler.enableTypeAssertions) {
-        Type type = member.computeType(compiler);
+        DartType type = member.computeType(compiler);
         registerIsCheck(type.element);
         SourceString helper = compiler.backend.getCheckedModeHelper(type);
         if (helper != null) {
           Element helperElement = compiler.findHelper(helper);
           registerStaticUse(helperElement);
         }
-      }  
+      }
       return;
     }