Simplify volume manager in Files app.

chrome/browser/resources/file_manager/foreground/js/file_transfer_controller.js

 // 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 strict';
 
 /**
  * Global (placed in the window object) variable name to hold internal
  * file dragging information. Needed to show visual feedback while dragging
  * since DataTransfer object is in protected state. Reachable from other
@@ skipping 141 matching lines @@
    * @param {DataTransfer} dataTransfer DataTransfer from the event.
    * @param {string} effectAllowed Value must be valid for the
    *     |dataTransfer.effectAllowed| property ('move', 'copy', 'copyMove').
    */
   cutOrCopy_: function(dataTransfer, effectAllowed) {
     // Existence of the volumeInfo is checked in canXXX methods.
     var volumeInfo = this.volumeManager_.getVolumeInfo(
         this.currentDirectoryContentEntry);
     // Tag to check it's filemanager data.
     dataTransfer.setData('fs/tag', 'filemanager-data');
-    dataTransfer.setData('fs/sourceRootURL', volumeInfo.root.toURL());
+    dataTransfer.setData('fs/sourceRootURL',
+                         volumeInfo.fileSystem.root.toURL());
     var sourceURLs = util.entriesToURLs(this.selectedEntries_);
     dataTransfer.setData('fs/sources', sourceURLs.join('\n'));
     dataTransfer.effectAllowed = effectAllowed;
     dataTransfer.setData('fs/effectallowed', effectAllowed);
     dataTransfer.setData('fs/missingFileContents',
                          !this.isAllSelectedFilesAvailable_());
 
     for (var i = 0; i < this.selectedFileObjects_.length; i++) {
       dataTransfer.items.add(this.selectedFileObjects_[i]);
     }
@@ skipping 563 matching lines @@
       return false;
     var destinationLocationInfo =
         this.volumeManager_.getLocationInfo(destinationEntry);
     if (destinationLocationInfo.isReadOnly)
       return false;
     if (!dataTransfer.types || dataTransfer.types.indexOf('fs/tag') === -1)
       return false;  // Unsupported type of content.
 
     // Copying between different sources requires all files to be available.
     if (this.getSourceRootURL_(dataTransfer) !==
-        destinationLocationInfo.volumeInfo.root.toURL() &&
+        destinationLocationInfo.volumeInfo.fileSystem.root.toURL() &&
         this.isMissingFileContents_(dataTransfer))
       return false;
 
     return true;
   },
 
   /**
    * Execute paste command.
    *
    * @this {FileTransferController}
@@ skipping 166 matching lines @@
     if (!destinationLocationInfo)
       return 'none';
     if (destinationLocationInfo.isReadOnly)
       return 'none';
     if (event.dataTransfer.effectAllowed === 'move')
       return 'move';
     // TODO(mtomasz): Use volumeId instead of comparing roots, as soon as
     // volumeId gets unique.
     if (event.dataTransfer.effectAllowed === 'copyMove' &&
         this.getSourceRootURL_(event.dataTransfer) ===
-            destinationLocationInfo.volumeInfo.root.toURL() &&
+            destinationLocationInfo.volumeInfo.fileSystem.root.toURL() &&
         !event.ctrlKey) {
       return 'move';
     }
     if (event.dataTransfer.effectAllowed === 'copyMove' &&
         event.shiftKey) {
       return 'move';
     }
     return 'copy';
   },
 };