[Mojo Video Capture] Cleanup naming of classes/files in services/video_capture

services/video_capture/public/interfaces/device.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/capture/mojo/video_capture_types.mojom";
-import "services/video_capture/public/interfaces/video_capture_settings.mojom";
-import "services/video_capture/public/interfaces/video_frame_receiver.mojom";
+import "services/video_capture/public/interfaces/capture_settings.mojom";
+import "services/video_capture/public/interfaces/receiver.mojom";
 
 // Represents access to a video capture device available on the machine.
 // Note: Instead of offering an explicit Stop() method, the device
 // is stopped automatically when the message pipe corresponding to either the
-// VideoCaptureDeviceProxy or the given VideoFrameReceiver is closed.
-// The frames deliverd to |receiver| are guaranteed to use I420 encoding and
-// are backed by Mojo shared buffers.
-interface VideoCaptureDeviceProxy {
-  Start(VideoCaptureSettings requested_settings,
-        VideoFrameReceiver receiver);
+// Device or the given |receiver| is closed. The frames deliverd to |receiver|
+// are guaranteed to use I420 encoding and are backed by Mojo shared buffers.
+interface Device {
+  Start(CaptureSettings requested_settings, Receiver receiver);
 };