contributeToPipelineBuilding: cleaning

[Ducasse]

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