InDetTrackSplitterTool → InDetDetDescr Relation

File in InnerDetector/InDetValidation/InDetTrackSplitterTool	Includes file in InnerDetector/InDetDetDescr
src / InDetTrackSplitterTool.cxx	InDetIdentifier / InDetIdentifier / TRT_ID.h
src / InDetTrackSplitterTool.cxx	InDetIdentifier / InDetIdentifier / SCT_ID.h