Adds ImageWriterPrivate.destroyPartitions operation.

chrome/common/extensions/api/image_writer_private.idl

 // 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.
 
 // Use the <code>chrome.image_writer</code> API to write images to
 // removable media.
 [nodoc] namespace imageWriterPrivate {
   // The different stages of a write call.
   //
   // <dl>
@@ skipping 83 matching lines @@
 
     // Cancel a current write operation.
     //
     // |callback|: The callback which is triggered with the write is
     // successfully cancelled, passing the $ref:ProgressInfo of the operation at
     // the time it was cancelled.
     static boolean cancelWrite(WriteCancelCallback callback);
 
     // Destroys the partition table of a disk, effectively erasing it.  This is
     // a fairly quick operation and so it does not have complex stages or
-    // progress information.  However, it can fail and call the callback with
-    // an error.
+    // progress information, just a write phase.
     //
     // |storageUnitId|: The identifier of the storage unit to wipe
-    // |callback|: A callback which is called when the operation is complete.
+    // |callback|: A callback that triggers when the operation has been
+    // successfully started.
     static void destroyPartitions(DOMString storageUnitId,
                                   DestroyPartitionsCallback callback);
 
     // List all the removable block devices currently attached to the system.
     // |callback|: A callback called with a list of removable storage devices
     static void listRemovableStorageDevices(
         ListRemovableStorageDevicesCallback callback);
   };
 
   interface Events {
@@ skipping 11 matching lines @@
 
     // Fires when a removable storage device is inserted.
     static void onDeviceInserted(RemovableStorageDevice device);
 
     // Fires when a removable storage device is removed.
     static void onDeviceRemoved(RemovableStorageDevice device);
   };
 
 };