[core] Removed unused constructorupstream/tvn-test-ci-time-out

Not in use at the moment, was causing a compiler error on
Apple LLVM version 8.0.0 (clang-800.0.42.1).

```
src/mbgl/sprite/sprite_loader.cpp:25:11: error: call to constructor of
'Actor<mbgl::SpriteLoaderWorker>' is ambiguous
```

1 files changed, 0 insertions, 31 deletions

diff --git a/test/actor/actor.test.cpp b/test/actor/actor.test.cpp
index 39d7ff81f4..2b4c83f566 100644
--- a/test/actor/actor.test.cpp
+++ b/test/actor/actor.test.cpp
@@ -305,34 +305,3 @@ TEST(Actor, Ask) {
     ASSERT_EQ(std::future_status::ready, status);
     ASSERT_EQ(2, result.get());
 }
-
-TEST(Actor, NoSelfActorRef) {
-    // Not all actors need a reference to self
-
-    // Trivially constructable
-    struct Trivial {};
-
-    ThreadPool pool { 2 };
-    Actor<Trivial> trivial(pool);
-
-
-    // With arguments
-    struct WithArguments {
-        std::promise<void> promise;
-
-        WithArguments(std::promise<void> promise_)
-                : promise(std::move(promise_)) {
-        }
-
-        void receive() {
-            promise.set_value();
-        }
-    };
-
-    std::promise<void> promise;
-    auto future = promise.get_future();
-    Actor<WithArguments> withArguments(pool, std::move(promise));
-
-    withArguments.invoke(&WithArguments::receive);
-    future.wait();
-}