[Extensions] Update last_error.js, send_request.js

extensions/renderer/v8_context_native_handler.cc

Index: extensions/renderer/v8_context_native_handler.cc
diff --git a/extensions/renderer/v8_context_native_handler.cc b/extensions/renderer/v8_context_native_handler.cc
index 8285b66e8291a3bdb1c6b159d6b4e07bd029f10c..6124311e5619e490babfbe25ac95dd2415d44725 100644
--- a/extensions/renderer/v8_context_native_handler.cc
+++ b/extensions/renderer/v8_context_native_handler.cc
@@ -33,6 +33,9 @@ void V8ContextNativeHandler::GetAvailability(
   Feature::Availability availability = context_->GetAvailability(api_name);
 
   v8::Local<v8::Object> ret = v8::Object::New(isolate);
+  v8::Maybe<bool> maybe =
+      ret->SetPrototype(context_->v8_context(), v8::Null(isolate));
+  CHECK(maybe.IsJust() && maybe.FromJust());
   ret->Set(v8::String::NewFromUtf8(isolate, "is_available"),
            v8::Boolean::New(isolate, availability.is_available()));
   ret->Set(v8::String::NewFromUtf8(isolate, "message"),