Remove dead code in BFCancellationTokenSource.

Bolts/Common/BFCancellationTokenSource.m

@@ -12,23 +12,12 @@
 
 #import "BFCancellationToken.h"
 
-@interface BFCancellationTokenSource ()
-
-@property (nonatomic, strong, readwrite) BFCancellationToken *token;
-@property (atomic, assign, readwrite, getter=isCancellationRequested) BOOL cancellationRequested;
-@property (atomic, assign) BOOL disposed;
-@property (nonatomic, strong) NSObject *lock;
-
-@end
-
 @interface BFCancellationToken (BFCancellationTokenSource)
 
 - (void)cancel;
-
 - (void)cancelAfterDelay:(int)millis;
 
 - (void)dispose;
-
 - (void)throwIfDisposed;
 
 @end
@@ -37,18 +26,19 @@ @implementation BFCancellationTokenSource
 
 #pragma mark - Initializer
 
-+ (instancetype)cancellationTokenSource {
-    return [BFCancellationTokenSource new];
-}
-
 - (instancetype)init {
-    if (self = [super init]) {
-        _token = [BFCancellationToken new];
-        _lock = [NSObject new];
-    }
+    self = [super init];
+    if (!self) return nil;
+
+    _token = [BFCancellationToken new];
+
     return self;
 }
 
++ (instancetype)cancellationTokenSource {
+    return [BFCancellationTokenSource new];
+}
+
 #pragma mark - Custom Setters/Getters
 
 - (BOOL)isCancellationRequested {