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

src/builtins.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1155 matching lines @@
   if (is_construct) {
     Handle<FunctionTemplateInfo> desc(fun_data, isolate);
     bool pending_exception = false;
     isolate->factory()->ConfigureInstance(
         desc, Handle<JSObject>::cast(args.receiver()), &pending_exception);
     ASSERT(isolate->has_pending_exception() == pending_exception);
     if (pending_exception) return Failure::Exception();
     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()) {
     // This function cannot be called with the given receiver.  Abort!
     Handle<Object> obj =
         isolate->factory()->NewTypeError(
             "illegal_invocation", HandleVector(&function, 1));
     return isolate->Throw(*obj);
   }
 
@@ skipping 544 matching lines @@
 }
 BUILTIN_LIST_C(DEFINE_BUILTIN_ACCESSOR_C)
 BUILTIN_LIST_A(DEFINE_BUILTIN_ACCESSOR_A)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 
 
 } }  // namespace v8::internal