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

media/video/capture/video_capture_device.cc

Index: media/video/capture/video_capture_device.cc
diff --git a/media/video/capture/video_capture_device.cc b/media/video/capture/video_capture_device.cc
index 2efff7de02c1860e41ccfe49c96b180ca058ba9b..0ff644027b3fc21176869fec00cd48c8528c904d 100644
--- a/media/video/capture/video_capture_device.cc
+++ b/media/video/capture/video_capture_device.cc
@@ -19,6 +19,31 @@ const std::string VideoCaptureDevice::Name::GetNameAndModel() const {
   return device_name_ + suffix;
 }
 
+VideoCaptureDevice::Name::Name() {}
+
+VideoCaptureDevice::Name::Name(const std::string& name, const std::string& id)
+    : device_name_(name), unique_id_(id) {}
+
+#if defined(OS_WIN) || defined(OS_MACOSX)
+VideoCaptureDevice::Name::Name(const std::string& name,
+                               const std::string& id,
+                               const CaptureApiType api_type)
+    : device_name_(name), unique_id_(id), capture_api_class_(api_type) {}
+#endif
+
+#if defined(OS_MACOSX)
+VideoCaptureDevice::Name::Name(const std::string& name,
+                               const std::string& id,
+                               const CaptureApiType api_type,
+                               const TransportType transport_type)
+    : device_name_(name),
+      unique_id_(id),
+      capture_api_class_(api_type),
+      transport_class_(transport_type) {}
+#endif
+
+VideoCaptureDevice::Name::~Name() {}
+
 VideoCaptureDevice::~VideoCaptureDevice() {}
 
 int VideoCaptureDevice::GetPowerLineFrequencyForLocation() const {