Language tests updated to use const instead of final.

tests/language/library10.dart

Index: tests/language/library10.dart
diff --git a/tests/language/library10.dart b/tests/language/library10.dart
index b8b44c7dae1a53f0936e2a30e4563990ce834e15..5fa4be474f08ce3ae24d702e32f18b23d411f58e 100644
--- a/tests/language/library10.dart
+++ b/tests/language/library10.dart
@@ -30,7 +30,7 @@ class Library10 {
   static var static_fld = 4;
 }
 
-final int top_level10 = 10;
+const int top_level10 = 10;
 top_level_func10() {
   return 20;
 }