Why do you say that? I haven’t tried it in UE 4.10, but I know it works in UE 4.9. Its the section named UE 4.6 and onward you should look at, it tells you to do something like this:
AMyCharacter::AMyCharacter(const class FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer.SetDefaultSubobjectClass<UCustomCharacterMovementComponent>(ACharacter::CharacterMovementComponentName)) { ... }