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This CL adds support for storage of the camera connection
information in the devices' names enumeration and subsequently
in the VideoCaptureDevice::Name structure.

-[AVCaptureDevice transportType] indicates the connection type 
to the camera: USB, Built-in, PCI, etc. Note that this info is only 
available for AVFoundation API and not for QTKit. 

Chromium style check forces to move complex constructors
and destructors from video_capture_device.h to .cc.

TEST: Verify that the FaceTime Built-in HD (USB) used in 
MBA >=2013 does not show incorrect modelID and vendorID
in the camera name -- those fields should be empty since
they only exist for USB or built-in cameras..

BUG=336651

Review URL: https://codereview.chromium.org/366593003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282063 0039d316-1c4b-4281-b951-d872f2087c98