[SystemInfo API] Update systemInfo.storage API StorageUnitInfo Definition.

chrome/common/extensions/api/experimental_system_info_storage.idl

 // 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.
 
 // Use the <code>chrome.experimental.systemInfo.storage</code> API to query
 // storage device information and be notified when it changes.
 namespace experimental.systemInfo.storage {
 
   enum StorageUnitType {
     // The storage has fixed media, e.g. hard disk or SSD.
     fixed,
     // The storage is removable, e.g. USB flash drive.
     removable,
     // The storage type is unknown.
     unknown
   };
 
   dictionary StorageUnitInfo {
     // The unique storage id. It will use the transient ID.
     DOMString id;
     // The name of the storage unit.
     DOMString name;
     // The media type of the storage unit.
     StorageUnitType type;
     // The total amount of the storage space, in bytes.
     // Default value is 0 if query operation fails.
     double capacity;
-    // The available amount of the storage space, in bytes.
-    // Default value is 0 if query operation fails.
-    double availableCapacity;
   };
 
   [inline_doc] enum EjectDeviceResultCode {
     // The ejection command is successful -- the application can prompt the user
     // to remove the device.
     success,
     // The device is in use by another application. The ejection did not
     // succeed; the user should not remove the device until the other
     // application is done with the device.
     in_use,
@@ skipping 45 matching lines @@
     // Get all the watched storage devices.
     static void getAllWatch(GetAllWatchCallback callback);
 
     // Remove all the storage devices monitors.
     static void removeAllWatch();
   };
 
   interface Events {
     // Fired when the storage device available capacity is changed.
     // |info|: The changed information for the specified storage unit.
     static void onAvailableCapacityChanged(StorageFreeSpaceChangeInfo info);

[not at google - send to devlin, 2013/07/25 14:34:02]

what about this event?

 
     // Fired when a new removable storage is attached to the system.
     static void onAttached(StorageUnitInfo info);
 
     // Fired when a removable storage is detached from the system.
     static void onDetached(DOMString id);
   };
 
 };