Do nothing on OnSessionStopped if ARC is being restarted.

components/arc/arc_session_observer.h

Index: components/arc/arc_session_observer.h
diff --git a/components/arc/arc_session_observer.h b/components/arc/arc_session_observer.h
deleted file mode 100644
index 2751e35ec7bc24b3abab4d6f216cffbcef06d7ec..0000000000000000000000000000000000000000
--- a/components/arc/arc_session_observer.h
+++ /dev/null
@@ -1,48 +0,0 @@
-// 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 COMPONENTS_ARC_ARC_SESSION_OBSERVER_H_
-#define COMPONENTS_ARC_ARC_SESSION_OBSERVER_H_
-
-#include <ostream>
-
-namespace arc {
-
-// Interface to observe the ARC instance running state.
-class ArcSessionObserver {
- public:
-  // Describes the reason the ARC instance is stopped.
-  enum class StopReason {
-    // ARC instance has been gracefully shut down.
-    SHUTDOWN,
-
-    // Errors occurred during the ARC instance boot. This includes any failures
-    // before the instance is actually attempted to be started, and also
-    // failures on bootstrapping IPC channels with Android.
-    GENERIC_BOOT_FAILURE,
-
-    // The device is critically low on disk space.
-    LOW_DISK_SPACE,
-
-    // ARC instance has crashed.
-    CRASH,
-  };
-
-  virtual ~ArcSessionObserver() = default;
-
-  // Called when the connection with ARC instance has been established.
-  virtual void OnSessionReady() {}
-
-  // Called when ARC instance is stopped. This is called exactly once
-  // per instance which is Start()ed.
-  virtual void OnSessionStopped(StopReason reason) {}
-};
-
-// Defines "<<" operator for LOGging purpose.
-std::ostream& operator<<(std::ostream& os,
-                         ArcSessionObserver::StopReason reason);
-
-}  // namespace arc
-
-#endif  // COMPONENTS_ARC_ARC_SESSION_OBSERVER_H_