[Mojo Video Capture] Stop service when last client disconnects.

services/video_capture/test/mock_device_factory.h

 // 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.
 
 #ifndef SERVICES_VIDEO_CAPTURE_TEST_MOCK_DEVICE_FACTORY_H_
 #define SERVICES_VIDEO_CAPTURE_TEST_MOCK_DEVICE_FACTORY_H_
 
 #include <map>
 
 #include "media/capture/video/video_capture_device_factory.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/video_capture/device_media_to_mojo_adapter.h"
 
 namespace video_capture {
 
 // Implementation of media::VideoCaptureDeviceFactory that allows clients to
 // add mock devices.
 class MockDeviceFactory : public media::VideoCaptureDeviceFactory {
  public:
   MockDeviceFactory();
   ~MockDeviceFactory() override;
 
   void AddMockDevice(media::VideoCaptureDevice* device,
                      const media::VideoCaptureDeviceDescriptor& descriptor);
 
-  // media::VideoCaptureDeviceFactory:
+  // media::VideoCaptureDeviceFactory implementation.
   std::unique_ptr<media::VideoCaptureDevice> CreateDevice(
       const media::VideoCaptureDeviceDescriptor& device_descriptor) override;
   void GetDeviceDescriptors(
       media::VideoCaptureDeviceDescriptors* device_descriptors) override;
   void GetSupportedFormats(
       const media::VideoCaptureDeviceDescriptor& device_descriptor,
       media::VideoCaptureFormats* supported_formats) override;
 
  private:
   std::map<media::VideoCaptureDeviceDescriptor, media::VideoCaptureDevice*>
       devices_;
 };
 
 }  // namespace video_capture
 
 #endif  // SERVICES_VIDEO_CAPTURE_TEST_MOCK_DEVICE_FACTORY_H_