Do nothing on OnSessionStopped if ARC is being restarted.

chrome/browser/chromeos/arc/notification/arc_boot_error_notification.h

Index: chrome/browser/chromeos/arc/notification/arc_boot_error_notification.h
diff --git a/chrome/browser/chromeos/arc/notification/arc_boot_error_notification.h b/chrome/browser/chromeos/arc/notification/arc_boot_error_notification.h
index aa6c03dd76a25cb4869a6a0dfdcc926af8bd5f9f..1fe6e06a91c6309f9ab2a5a5a6a0c0027f48a5e2 100644
--- a/chrome/browser/chromeos/arc/notification/arc_boot_error_notification.h
+++ b/chrome/browser/chromeos/arc/notification/arc_boot_error_notification.h
@@ -6,19 +6,20 @@
 #define CHROME_BROWSER_CHROMEOS_ARC_NOTIFICATION_ARC_BOOT_ERROR_NOTIFICATION_H_
 
 #include "base/macros.h"
+#include "chrome/browser/chromeos/arc/arc_session_manager.h"
 #include "components/arc/arc_service.h"
-#include "components/arc/arc_session_observer.h"
 
 namespace arc {
 
 // Watches for ARC boot errors and show notifications.
-class ArcBootErrorNotification : public ArcService, public ArcSessionObserver {
+class ArcBootErrorNotification : public ArcService,
+                                 public ArcSessionManager::Observer {
  public:
   explicit ArcBootErrorNotification(ArcBridgeService* bridge_service);
   ~ArcBootErrorNotification() override;
 
-  // ArcSessionObserver:
-  void OnSessionStopped(StopReason reason) override;
+  // ArcSessionManager::Observer:
+  void OnArcSessionStopped(ArcStopReason reason) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ArcBootErrorNotification);