[fsp] Add requestUnmount() method together with the request manager.

chrome/browser/chromeos/extensions/file_manager/private_api_mount.h

 // Copyright 2013 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.
 //
 // This file provides task related API functions.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
 #include "chrome/browser/chromeos/extensions/file_manager/private_api_base.h"
 
 namespace ui {
 struct SelectedFileInfo;
 }
 
 namespace extensions {
 
 // Implements chrome.fileBrowserPrivate.addMount method.
-// Mounts a device or a file.
+// Mounts removable devices and archive files.
 class FileBrowserPrivateAddMountFunction : public LoggedAsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.addMount",
                              FILEBROWSERPRIVATE_ADDMOUNT)
 
  protected:
   virtual ~FileBrowserPrivateAddMountFunction() {}
 
   // AsyncExtensionFunction overrides.
   virtual bool RunImpl() OVERRIDE;
 
  private:
   // Part of Run(). Called after MarkCacheFielAsMounted for Drive File System.
   // (or directly called from RunImpl() for other file system).
   void RunAfterMarkCacheFileAsMounted(const base::FilePath& display_name,
                                       drive::FileError error,
                                       const base::FilePath& file_path);
 };
 
 // Implements chrome.fileBrowserPrivate.removeMount method.
-// Unmounts selected device. Expects mount point path as an argument.
+// Unmounts selected volume. Expects volume id as an argument.
 class FileBrowserPrivateRemoveMountFunction
     : public LoggedAsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileBrowserPrivate.removeMount",
                              FILEBROWSERPRIVATE_REMOVEMOUNT)
 
  protected:
   virtual ~FileBrowserPrivateRemoveMountFunction() {}
 
   // AsyncExtensionFunction overrides.
@@ skipping 10 matching lines @@
  protected:
   virtual ~FileBrowserPrivateGetVolumeMetadataListFunction() {}
 
   // AsyncExtensionFunction overrides.
   virtual bool RunImpl() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_PRIVATE_API_MOUNT_H_