drive: Introduce DriveSystemServiceObserver

chrome/browser/chromeos/drive/drive_file_system_interface.h

 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_INTERFACE_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_INTERFACE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 137 matching lines @@
   virtual ~DriveFileSystemInterface() {}
 
   // Initializes the object. This function should be called before any
   // other functions.
   virtual void Initialize() = 0;
 
   // Adds and removes the observer.
   virtual void AddObserver(DriveFileSystemObserver* observer) = 0;
   virtual void RemoveObserver(DriveFileSystemObserver* observer) = 0;
 
-  // Notifies the file system was just mounted.
-  virtual void NotifyFileSystemMounted() = 0;
-
-  // Notifies the file system is going to be unmounted.
-  virtual void NotifyFileSystemToBeUnmounted() = 0;
-
   // Checks for updates on the server.
   virtual void CheckForUpdates() = 0;
 
   // Finds an entry (file or directory) by using |resource_id|. This call
   // does not initiate content refreshing.
   //
   // |callback| must not be null.
   virtual void GetEntryInfoByResourceId(
       const std::string& resource_id,
       const GetEntryInfoWithFilePathCallback& callback) = 0;
@@ skipping 252 matching lines @@
   virtual void GetMetadata(
       const GetFilesystemMetadataCallback& callback) = 0;
 
   // Reloads the file system feeds from the server.
   virtual void Reload() = 0;
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_INTERFACE_H_