Move RTCVideoSource to webrtc/api/objc.

webrtc/api/objc/RTCVideoSource+Private.h

Index: webrtc/api/objc/RTCVideoSource+Private.h
diff --git a/webrtc/api/objc/RTCVideoFrame+Private.h b/webrtc/api/objc/RTCVideoSource+Private.h
similarity index 62%
copy from webrtc/api/objc/RTCVideoFrame+Private.h
copy to webrtc/api/objc/RTCVideoSource+Private.h
index 954344aee1b9c2095f03277bc1cc4a800e35e1a9..61e18566270d4ca199f593ded12b6547b1d3d619 100644
--- a/webrtc/api/objc/RTCVideoFrame+Private.h
+++ b/webrtc/api/objc/RTCVideoSource+Private.h
@@ -8,15 +8,17 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#import "RTCVideoFrame.h"
+#import "RTCVideoSource.h"
 
-#include "talk/media/base/videoframe.h"
+#include "talk/app/webrtc/videosourceinterface.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface RTCVideoFrame ()
+@interface RTCVideoSource ()
 
-- (instancetype)initWithNativeFrame:(const cricket::VideoFrame *)nativeFrame
+/** Initialize an RTCVideoSource from a native VideoSourceInterface. */
+- (instancetype)initWithNativeVideoSource:
+    (rtc::scoped_refptr<webrtc::VideoSourceInterface>)nativeVideoSource
     NS_DESIGNATED_INITIALIZER;
 
 @end