Refactor class declaration logic to the parser and runtime

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index 02fc6d47a40025bdfce413f78b47a50af8fca010..aec3883082c74b0f547f6c5547ed2812eb25d1a0 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -1477,8 +1477,7 @@ TEST(DiscardFunctionBody) {
         fun = exp->AsObjectLiteral()->properties()->at(0)->value()->
               AsFunctionLiteral();
       } else {
-        fun = exp->AsClassLiteral()->properties()->at(0)->value()->
-              AsFunctionLiteral();
+        fun = exp->AsDoExpression()->represented_function();
       }
     }
     CHECK_NULL(fun->body());