removing useNewBfieldCache - no longer needed

DataQuality/DataQualityTools/src/DQTDetSynchMonAlg.cxx

@@ -399,7 +399,7 @@ StatusCode DQTDetSynchMonAlg::fillHistograms( const EventContext& ctx ) const
    auto solenoid_bz = Monitored::Scalar("solenoid_bz", f[2]*1000.);
 
    Amg::Vector3D  gP2(m_toroidPositionX, m_toroidPositionY, m_toroidPositionZ);
-   if (fieldCache.useNewBfieldCache()) fieldCache.getField(gP2.data(),f.data());
+   fieldCache.getField(gP2.data(),f.data());
 
    auto toroid_bx = Monitored::Scalar("toroid_bx", f[0]*1000.);
 

MagneticField/MagFieldElements/MagFieldElements/AtlasFieldCache.h

@@ -51,9 +51,6 @@ public:
   AtlasFieldCache(AtlasFieldCache&& other) = default;
   ~AtlasFieldCache() = default;
 
-  /// Temporary flag for switching between 'old' and 'new' magField usage
-  bool useNewBfieldCache() { return true; }
-
   /** get B field value at given position
    * xyz[3] is in mm, bxyz[3] is in kT
    * if deriv[9] is given, field derivatives are returned in kT/mm