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

media/video/capture/mac/avfoundation_glue.h

 // 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.
 
 // AVFoundation API is only introduced in Mac OS X > 10.6, and there is only one
 // build of Chromium, so the (potential) linking with AVFoundation has to happen
 // in runtime. For this to be clean, an AVFoundationGlue class is defined to try
 // and load these AVFoundation system libraries. If it succeeds, subsequent
 // clients can use AVFoundation via the rest of the classes declared in this
 // file.
@@ skipping 44 matching lines @@
 
 // Originally AVCaptureDevice and coming from AVCaptureDevice.h
 MEDIA_EXPORT
 @interface CrAVCaptureDevice : NSObject
 
 - (BOOL)hasMediaType:(NSString*)mediaType;
 - (NSString*)uniqueID;
 - (NSString*)localizedName;
 - (BOOL)isSuspended;
 - (NSArray*)formats;
+- (int32_t)transportType;
 
 @end
 
 // Originally AVCaptureDeviceFormat and coming from AVCaptureDevice.h.
 MEDIA_EXPORT
 @interface CrAVCaptureDeviceFormat : NSObject
 
 - (CoreMediaGlue::CMFormatDescriptionRef)formatDescription;
 - (NSArray*)videoSupportedFrameRateRanges;
 
@@ skipping 86 matching lines @@
 // Class to provide access to class methods of AVCaptureDeviceInput.
 MEDIA_EXPORT
 @interface AVCaptureDeviceInputGlue : NSObject
 
 + (CrAVCaptureDeviceInput*)deviceInputWithDevice:(CrAVCaptureDevice*)device
                                            error:(NSError**)outError;
 
 @end
 
 #endif  // MEDIA_VIDEO_CAPTURE_MAC_AVFOUNDATION_GLUE_H_