Make the strict-mode calling convention for contextual calls the default one.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 919126363031ca70554a9b141e7b4ff5793ebb0f..a690b31b29d923c3bc4d38c1f6e9dd44167f833a 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1173,6 +1173,15 @@ MUST_USE_RESULT static MaybeObject* HandleApiCallHelper(
     fun_data = *desc;
   }
 
+  SharedFunctionInfo* shared = function->shared();
+  if (shared->is_classic_mode() && !shared->native()) {
+    Object* recv = args[0];
+    ASSERT(!recv->IsNull());
+    if (recv->IsUndefined()) {
+      args[0] = function->context()->global_object()->global_receiver();
+    }
+  }
+
   Object* raw_holder = TypeCheck(heap, args.length(), &args[0], fun_data);
 
   if (raw_holder->IsNull()) {