Thiago Marcos P. Santos 2dd8ec8854 [core] Removed unused constructor ...

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
```

2017-08-07 18:48:42 +03:00

..

mbgl

[core] Removed unused constructor

2017-08-07 18:48:42 +03:00