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

media/video/capture/mac/video_capture_device_avfoundation_mac.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "media/video/capture/mac/video_capture_device_avfoundation_mac.h"
 
 #import <CoreVideo/CoreVideo.h>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "media/video/capture/mac/video_capture_device_mac.h"
 #include "ui/gfx/size.h"
 
 @implementation VideoCaptureDeviceAVFoundation
 
 #pragma mark Class methods
 
 + (void)getDeviceNames:(NSMutableDictionary*)deviceNames {
   // At this stage we already know that AVFoundation is supported and the whole
   // library is loaded and initialised, by the device monitoring.
   NSArray* devices = [AVCaptureDeviceGlue devices];
   for (CrAVCaptureDevice* device in devices) {
     if (([device hasMediaType:AVFoundationGlue::AVMediaTypeVideo()] ||
          [device hasMediaType:AVFoundationGlue::AVMediaTypeMuxed()]) &&
         ![device isSuspended]) {
-      [deviceNames setObject:[device localizedName]
+      DeviceNameAndTransportType* nameAndTransportType =
+          [[[DeviceNameAndTransportType alloc]
+                 initWithName:[device localizedName]
+                transportType:[device transportType]] autorelease];
+      [deviceNames setObject:nameAndTransportType
                       forKey:[device uniqueID]];
     }
   }
 }
 
 + (NSDictionary*)deviceNames {
   NSMutableDictionary* deviceNames =
       [[[NSMutableDictionary alloc] init] autorelease];
   // The device name retrieval is not going to happen in the main thread, and
   // this might cause instabilities (it did in QTKit), so keep an eye here.
@@ skipping 247 matching lines @@
 }
 
 - (void)sendErrorString:(NSString*)error {
   DLOG(ERROR) << [error UTF8String];
   base::AutoLock lock(lock_);
   if (frameReceiver_)
     frameReceiver_->ReceiveError([error UTF8String]);
 }
 
 @end