ios: remove unused property from protocol

ios/IJKMediaPlayer/IJKMediaPlayer/IJKFFMoviePlayerController.m

@@ -66,15 +66,9 @@
 @synthesize playbackState = _playbackState;
 @synthesize loadState = _loadState;
 
-@synthesize naturalSize = _naturalSize;
-
 @synthesize controlStyle = _controlStyle;
 @synthesize scalingMode = _scalingMode;
 @synthesize shouldAutoplay = _shouldAutoplay;
-@synthesize useApplicationAudioSession = _useApplicationAudioSession;
-@synthesize currentPlaybackRate = _currentPlaybackRate;
-@synthesize initialPlaybackTime = _initialPlaybackTime;
-@synthesize endPlaybackTime = _endPlaybackTime;
 
 #define FFP_IO_STAT_STEP (50 * 1024)
 
@@ -163,10 +157,6 @@ void IJKFFIOStatCompleteRegister(void (*cb)(const char *url,
         _controlStyle = MPMovieControlStyleNone;
         _scalingMode = MPMovieScalingModeAspectFit;
         _shouldAutoplay = NO;
-        _useApplicationAudioSession = NO;
-        _currentPlaybackRate = 1.0f;
-        _initialPlaybackTime = 0;
-        _endPlaybackTime = 0;
 
         // init media resource
         _ffMrl = [[IJKFFMrl alloc] initWithMrl:aUrlString];

ios/IJKMediaPlayer/IJKMediaPlayer/IJKMPMoviePlayerController.m

@@ -38,15 +38,9 @@
 @dynamic playbackState;
 @dynamic loadState;
 
-@dynamic naturalSize;
-
 @dynamic controlStyle;
 @dynamic scalingMode;
 @dynamic shouldAutoplay;
-@dynamic useApplicationAudioSession;
-@dynamic currentPlaybackRate;
-@dynamic initialPlaybackTime;
-@dynamic endPlaybackTime;
 @synthesize numberOfBytesTransferred = _numberOfBytesTransferred;
 
 - (id)initWithContentURL:(NSURL *)aUrl

ios/IJKMediaPlayer/IJKMediaPlayer/IJKMediaPlayback.h

@@ -49,8 +49,6 @@
 @property(nonatomic, readonly)  MPMoviePlaybackState playbackState;
 @property(nonatomic, readonly)  MPMovieLoadState loadState;
 
-@property(nonatomic, readonly) CGSize naturalSize;
-
 @property(nonatomic, readonly) int64_t numberOfBytesTransferred;
 
 // deprecated, for MPMoviePlayerController compatiable
@@ -62,10 +60,6 @@
 @property(nonatomic) MPMovieControlStyle controlStyle;
 @property(nonatomic) MPMovieScalingMode scalingMode;
 @property(nonatomic) BOOL shouldAutoplay;
-@property(nonatomic) BOOL useApplicationAudioSession;
-@property(nonatomic) float currentPlaybackRate;
-@property(nonatomic) NSTimeInterval initialPlaybackTime;
-@property(nonatomic) NSTimeInterval endPlaybackTime;
 
 #pragma mark Notifications