mash: Change the MediaDelegate to a Media{Controller,Client}.

ash/common/system/chromeos/media_security/media_capture_observer.h

Index: ash/common/system/chromeos/media_security/media_capture_observer.h
diff --git a/ash/common/system/chromeos/media_security/media_capture_observer.h b/ash/common/system/chromeos/media_security/media_capture_observer.h
deleted file mode 100644
index 6aa1eac0f7ef588e1f71203b62f42d619c232595..0000000000000000000000000000000000000000
--- a/ash/common/system/chromeos/media_security/media_capture_observer.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2014 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 ASH_COMMON_SYSTEM_CHROMEOS_MEDIA_SECURITY_MEDIA_CAPTURE_OBSERVER_H_
-#define ASH_COMMON_SYSTEM_CHROMEOS_MEDIA_SECURITY_MEDIA_CAPTURE_OBSERVER_H_
-
-namespace ash {
-
-class MediaCaptureObserver {
- public:
-  // Called when media capture state has changed.
-  virtual void OnMediaCaptureChanged() = 0;
-
- protected:
-  virtual ~MediaCaptureObserver() {}
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_CHROMEOS_MEDIA_SECURITY_MEDIA_CAPTURE_OBSERVER_H_