[strong] Remove all remainders of strong mode

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index b8507d5eec18885cc87955a9845ea5ddf6d438f3..84389e872b1e79cfe5f1565e256d8d96ad820adf 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -1644,8 +1644,7 @@ void AstGraphBuilder::VisitClassLiteralContents(ClassLiteral* expr) {
     }
   }
 
-  // Set both the prototype and constructor to have fast properties, and also
-  // freeze them in strong mode.
+  // Set both the prototype and constructor to have fast properties.
   prototype = environment()->Pop();
   literal = environment()->Pop();
   const Operator* op =