Mac VideoCapture: return empty GetModel() for non-USB non-built-in cameras.

media/video/capture/fake_video_capture_device_factory.cc

Index: media/video/capture/fake_video_capture_device_factory.cc
diff --git a/media/video/capture/fake_video_capture_device_factory.cc b/media/video/capture/fake_video_capture_device_factory.cc
index 5183dc0e9fa103c608d350cdc92554cb93b0fde6..31ad67458e5186562afea2ce262c6db90b0a029e 100644
--- a/media/video/capture/fake_video_capture_device_factory.cc
+++ b/media/video/capture/fake_video_capture_device_factory.cc
@@ -29,8 +29,14 @@ void FakeVideoCaptureDeviceFactory::GetDeviceNames(
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(device_names->empty());
   for (int n = 0; n < number_of_devices_; ++n) {
+#if !defined(OS_MACOSX)
     VideoCaptureDevice::Name name(base::StringPrintf("fake_device_%d", n),
                                   base::StringPrintf("/dev/video%d", n));
+#else
+    VideoCaptureDevice::Name name(base::StringPrintf("fake_device_%d", n),
+                                  base::StringPrintf("/dev/video%d", n),
+                                  VideoCaptureDevice::Name::AVFOUNDATION);
+#endif
     device_names->push_back(name);
   }
 }