Move RTCAVFoundationCapturer to webrtc/api/objc.

webrtc/api/objc/RTCAVFoundationVideoSource+Private.h

Index: webrtc/api/objc/RTCAVFoundationVideoSource+Private.h
diff --git a/webrtc/api/objc/RTCVideoFrame+Private.h b/webrtc/api/objc/RTCAVFoundationVideoSource+Private.h
similarity index 68%
copy from webrtc/api/objc/RTCVideoFrame+Private.h
copy to webrtc/api/objc/RTCAVFoundationVideoSource+Private.h
index 954344aee1b9c2095f03277bc1cc4a800e35e1a9..64da9aa5f44631d907900fa052c861320c4d7341 100644
--- a/webrtc/api/objc/RTCVideoFrame+Private.h
+++ b/webrtc/api/objc/RTCAVFoundationVideoSource+Private.h
@@ -8,16 +8,15 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#import "RTCVideoFrame.h"
+#import "RTCAVFoundationVideoSource.h"
 
-#include "talk/media/base/videoframe.h"
+#include "webrtc/api/objc/avfoundationvideocapturer.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface RTCVideoFrame ()
+@interface RTCAVFoundationVideoSource ()
 
-- (instancetype)initWithNativeFrame:(const cricket::VideoFrame *)nativeFrame
-    NS_DESIGNATED_INITIALIZER;
+@property(nonatomic, readonly) webrtc::AVFoundationVideoCapturer *capturer;
 
 @end