media: Use native video enum types in media mojo interfaces

services/video_capture/public/interfaces/video_capture_format.mojom

 // Copyright 2016 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.
 
 module video_capture.mojom;
 
 import "media/mojo/interfaces/media_types.mojom";
 import "ui/gfx/geometry/mojo/geometry.mojom";
 
 enum VideoPixelStorage {
   CPU,
   GPUMEMORYBUFFER
 };
 
 struct VideoCaptureFormat {
   gfx.mojom.Size frame_size;
   float frame_rate;
-  media.mojom.VideoFormat pixel_format;
+  media.mojom.VideoPixelFormat pixel_format;
   VideoPixelStorage pixel_storage;
 };