Defer ARC file system operations while ARC is booting.

components/arc/file_system/arc_file_system_observer.h

Index: components/arc/file_system/arc_file_system_observer.h
diff --git a/components/arc/file_system/arc_file_system_observer.h b/components/arc/file_system/arc_file_system_observer.h
deleted file mode 100644
index e3718aa61f99a81368881e1aa325f14ce1c51c00..0000000000000000000000000000000000000000
--- a/components/arc/file_system/arc_file_system_observer.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2017 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_FILE_SYSTEM_ARC_FILE_SYSTEM_OBSERVER_H_
-#define COMPONENTS_ARC_FILE_SYSTEM_ARC_FILE_SYSTEM_OBSERVER_H_
-
-namespace arc {
-
-class ArcFileSystemObserver {
- public:
-  virtual ~ArcFileSystemObserver() = default;
-
-  // Called when ARC file systems are ready.
-  virtual void OnFileSystemsReady() = 0;
-
-  // Called when ARC file systems are closed.
-  virtual void OnFileSystemsClosed() = 0;
-};
-
-}  // namespace arc
-
-#endif  // COMPONENTS_ARC_FILE_SYSTEM_ARC_FILE_SYSTEM_OBSERVER_H_