Defer ARC file system operations while ARC is booting.

chrome/browser/chromeos/arc/fileapi/arc_file_system_service.h

Index: chrome/browser/chromeos/arc/fileapi/arc_file_system_service.h
diff --git a/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.h b/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.h
index 90800047bcd4e83d5e16969cf19dcce8fd1422e7..4bfb95a3d6612836e99772be46c2f160fa5f2577 100644
--- a/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.h
+++ b/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.h
@@ -6,37 +6,22 @@
 #define CHROME_BROWSER_CHROMEOS_ARC_FILEAPI_ARC_FILE_SYSTEM_SERVICE_H_
 
 #include "base/macros.h"
-#include "base/observer_list.h"
 #include "components/arc/arc_service.h"
-#include "components/arc/common/file_system.mojom.h"
-#include "components/arc/instance_holder.h"
 
 namespace arc {
 
 class ArcBridgeService;
-class ArcFileSystemObserver;
 
 // ArcFileSystemService registers ARC file systems to the system.
-class ArcFileSystemService
-    : public ArcService,
-      public InstanceHolder<mojom::FileSystemInstance>::Observer {
+class ArcFileSystemService : public ArcService {
  public:
-  explicit ArcFileSystemService(ArcBridgeService* bridge_service);
-  ~ArcFileSystemService() override;
-
-  void AddObserver(ArcFileSystemObserver* observer);
-  void RemoveObserver(ArcFileSystemObserver* observer);
-
-  // InstanceHolder<mojom::FileSystemInstance>::Observer overrides:
-  void OnInstanceReady() override;
-  void OnInstanceClosed() override;
-
   // For supporting ArcServiceManager::GetService<T>().
   static const char kArcServiceName[];
 
- private:
-  base::ObserverList<ArcFileSystemObserver> observer_list_;
+  explicit ArcFileSystemService(ArcBridgeService* bridge_service);
+  ~ArcFileSystemService() override;
 
+ private:
   DISALLOW_COPY_AND_ASSIGN(ArcFileSystemService);
 };