43fed272aa40fe1bb538039e375c83f74348756a
setViewController and extra import (flutter/engine#52255)
This stub PR removes and extra `setViewController`, which is unnecessary because the view controller's initializer already attaches itself to the engine. This PR also removes an extra import since `FlutterCompositor` is not used in the engine's definition. As a result, `FlutterEngineTest.mm` needs to import it explicitly. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
Description
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