[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 ca6fccd01039f5c5f2d0f2c8029e50d097eed9a2..a8b074e3f226a5f05284ba5c8226412e9280df48 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 =