contributeToPipelineBuilding: cleaning


```
PRInputDocument >> contributeToPipelineBuilding: aPRPipelineBuilder 
	
	1halt.
	self flag: #maybeToRemove.
	
	aPRPipelineBuilder setInputDocument: file.
	aPRPipelineBuilder parser: self parser
```

So we should remove it because it is not invoked and setInputDocument: does not exist anymore 