System/Library/PrivateFrameworks/CallHistory.framework
CHDeviceDataSource.h
@class NSString;
@interface CHDeviceDataSource : NSObject <CHDeviceDataSource>
@property (readonly, nonatomic, getter=isBootLockEnabled) BOOL bootLockEnabled;
@property (readonly) unsigned long long hash;
@property (readonly) Class superclass;
@property (readonly, copy) NSString *description;
@property (readonly, copy) NSString *debugDescription;
@end