Get rid of mountPath dependency in Files app.

chrome/common/extensions/api/file_browser_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.
 
 // fileBrowserPrivate API.
 // This is a private API used by the file browser of ChromeOS.
 [platforms=("chromeos"),
  implemented_in="chrome/browser/chromeos/extensions/file_manager/file_browser_private_api_functions.h"]
 namespace fileBrowserPrivate {
 // Type of the mounted volume.
@@ skipping 194 matching lines @@
   DOMString? imageUri;
 };
 
 // Mounted disk volume metadata.
 dictionary VolumeMetadata {
   // ID of the disk volume.
   DOMString volumeId;
 
   // Description of the profile where the volume belongs.
   // TODO(hirono): Remove the property because of the design change of
-  // multi-profile suuport.
+  // multi-profile support.
   ProfileInfo profile;
 
-  // Disk volume mount point path.
-  DOMString mountPath;
-
   // The path to the mounted device, archive file or network resource.
   DOMString? sourcePath;
 
   // Type of the mounted volume.
   VolumeType volumeType;
 
   // Device type. Available if this is removable volume.
   DeviceType? deviceType;
 
   // Path to identify the device. This is consistent with DeviceEvent's
@@ skipping 502 matching lines @@
   static void onDriveSyncError(DriveSyncErrorEvent event);
 
   // Dispatched when a profile is added.
   static void onProfileAdded();
 
   // Dispatched when any window moves another desktop.
   // TODO(hirono): Add information which window is moved.
   static void onDesktopChanged();
 };
 };