I would say keep em, you might get the odd stone stuck. It they do protect the disk. Also my prev 110 had them removed and the swivel seal started to slightly leak on to the disc so suddenly started pulling to one side under braking.
 
If you're having trouble with trapped stones bin them. If not then leave them on until they become a problem, you need to do some work to the brakes, or they rust away.
 

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