src/vs/editor/common/services/modelService.ts/ModelService/_removeDisposedModel
class ModelService:	private _removeDisposedModel(resource: URI): DisposedModelInfo | undefined {
		const disposedModelData = this._disposedModels.get(MODEL_ID(resource));
		if (disposedModelData) {
			this._disposedModelsHeapSize -= disposedModelData.heapSize;
		}
		this._disposedModels.delete(MODEL_ID(resource));
		return disposedModelData;
	}