VP1BPhysSystems: Remove dependency on EventInfo.

Remove dependency on old EventInfo class.

graphics/VP1/VP1Systems/VP1BPhysSystems/CMakeLists.txt

-# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( VP1BPhysSystems )
@@ -22,4 +22,4 @@ atlas_add_library( VP1BPhysSystems VP1BPhysSystems/*.h src/*.h src/*.cxx src/*.q
                    PUBLIC_HEADERS VP1BPhysSystems
                    PRIVATE_INCLUDE_DIRS ${ROOT_INCLUDE_DIRS} ${COIN3D_INCLUDE_DIRS}
                    LINK_LIBRARIES GeoPrimitives VP1Base VP1TrackSystems GL
-                   PRIVATE_LINK_LIBRARIES ${ROOT_LIBRARIES} ${COIN3D_LIBRARIES} EventInfo Particle StoreGateLib TrkExInterfaces TrkParameters TrkTrack VP1Utils )
+                   PRIVATE_LINK_LIBRARIES ${ROOT_LIBRARIES} ${COIN3D_LIBRARIES} Particle StoreGateLib TrkExInterfaces TrkParameters TrkTrack VP1Utils )

graphics/VP1/VP1Systems/VP1BPhysSystems/src/VP1BPhysSystem.cxx

 /*
-  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 */
 
 /////////////////////////////////////////////////////////////////////////
@@ -36,8 +36,6 @@
 
 
 #include "StoreGate/StoreGateSvc.h"
-#include "EventInfo/EventInfo.h"
-#include "EventInfo/EventID.h"
 
 #include "TrkTrack/Track.h"
 #include "TrkTrack/TrackCollection.h"
@@ -204,16 +202,9 @@ void VP1BPhysSystem::actualBuild() {
 	if(m_tree==nullptr) return;
 
   //retrieving event info
-	const EventInfo* eventInfo;
-	StatusCode sc = m_sg->retrieve(eventInfo);
-	if (!sc.isSuccess()) {
-		message("Error: Could not retrieve EventInfo");
-		return;
-	}
-
-	const EventID* eventID = eventInfo->event_ID(); // Get EventInfo
-	int evtNum = eventID->event_number();
-	int runNum = eventID->run_number();
+        const EventContext& ctx = Gaudi::Hive::currentContext();
+	int evtNum = ctx.eventID().event_number();
+	int runNum = ctx.eventID().run_number();
 
   //retrieve TrackParticle candidates
 	const Rec::TrackParticleContainer* partCont;