media: Add out-of-line copy ctors for complex classes.

media/capture/video/video_capture_device_info.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_INFO_H_
 #define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_INFO_H_
 
 #include "media/base/video_capture_types.h"
 #include "media/capture/video/video_capture_device.h"
 
 namespace media {
 
 // A convenience wrap of a device's name and associated supported formats.
 struct MEDIA_EXPORT VideoCaptureDeviceInfo {
   VideoCaptureDeviceInfo();
   VideoCaptureDeviceInfo(const VideoCaptureDevice::Name& name,
                          const VideoCaptureFormats& supported_formats);
+  VideoCaptureDeviceInfo(const VideoCaptureDeviceInfo& other);
   ~VideoCaptureDeviceInfo();
 
   VideoCaptureDevice::Name name;
   VideoCaptureFormats supported_formats;
 };
 
 typedef std::vector<VideoCaptureDeviceInfo> VideoCaptureDeviceInfos;
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_INFO_H_