Remove the MessageLoop::DestructionObserver from mojo bindings.

services/video_capture/test/mock_device_test.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_TEST_H_
 #define SERVICES_VIDEO_CAPTURE_TEST_MOCK_DEVICE_TEST_H_
 
 #include "base/test/mock_callback.h"
 #include "media/capture/video/video_capture_device.h"
 #include "services/video_capture/device_factory_media_to_mojo_adapter.h"
 #include "services/video_capture/public/cpp/capture_settings.h"
 #include "services/video_capture/public/interfaces/service.mojom.h"
 #include "services/video_capture/test/mock_device_factory.h"
 #include "services/video_capture/test/mock_receiver.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace base {
+class MessageLoop;
+}
+
 namespace video_capture {
 
 class MockDevice : public media::VideoCaptureDevice {
  public:
   MockDevice();
   ~MockDevice() override;
 
   // media::VideoCaptureDevice:
   MOCK_METHOD2(DoAllocateAndStart,
                void(const media::VideoCaptureParams& params,
@@ skipping 38 matching lines @@
   mojom::ReceiverPtr mock_receiver_proxy_;
   CaptureSettings requested_settings_;
 
  private:
   std::unique_ptr<base::MessageLoop> message_loop_;
 };
 
 }  // namespace video_capture
 
 #endif  // SERVICES_VIDEO_CAPTURE_TEST_MOCK_DEVICE_TEST_H_