Replace SetCapturer and SetCaptureDevice by SetSource.

talk/app/webrtc/objc/public/RTCAVFoundationVideoSource.h

Index: talk/app/webrtc/objc/public/RTCAVFoundationVideoSource.h
diff --git a/talk/app/webrtc/objc/public/RTCAVFoundationVideoSource.h b/talk/app/webrtc/objc/public/RTCAVFoundationVideoSource.h
index fcc8f1f2c0a256ecfab27b5d8cce4adc1019da89..a73e26863c9d672875e0424bf9c6acb673fa876e 100644
--- a/talk/app/webrtc/objc/public/RTCAVFoundationVideoSource.h
+++ b/talk/app/webrtc/objc/public/RTCAVFoundationVideoSource.h
@@ -36,7 +36,13 @@
 // that capturer because cricket::VideoCapturer is not ref counted and we cannot
 // guarantee its lifetime. Instead, we expose its properties through the ref
 // counted video source interface.
-@interface RTCAVFoundationVideoSource : RTCVideoSource
+@interface RTCAVFoundationVideoSource : RTCVideoSource {
+  // TODO(nisse): This is a crude hack, the pointer really is a
+  // webrtc::AVFoundationVideoCapturer*, but using a proper
+  // declaration with namespaces breaks inclusion from .m files, i.e.
+  // files which are Objective-C but not Objective-C++.
+  void *_capturer;
+}
 
 - (instancetype)initWithFactory:(RTCPeerConnectionFactory*)factory
                     constraints:(RTCMediaConstraints*)constraints;