Remove unused NavigationList-related code.

BUG=none
TEST=run browser_tests

Review URL: https://codereview.chromium.org/483673004

Cr-Commit-Position: refs/heads/master@{#291893}

ui/file_manager/file_manager/foreground/js/file_transfer_controller.js

@@ -133,20 +133,6 @@ FileTransferController.prototype = {
     tree.addEventListener('drop', this.onDrop_.bind(this, true));
   },
 
-  /**
-   * @this {FileTransferController}
-   * @param {NavigationList} tree Its sub items will could be drop target.
-   */
-  attachNavigationListDropTarget: function(list) {
-    list.addEventListener('dragover',
-        this.onDragOver_.bind(this, true /* onlyIntoDirectories */, list));
-    list.addEventListener('dragenter',
-        this.onDragEnterVolumesList_.bind(this, list));
-    list.addEventListener('dragleave', this.onDragLeave_.bind(this, list));
-    list.addEventListener('drop',
-        this.onDrop_.bind(this, true /* onlyIntoDirectories */));
-  },
-
   /**
    * Attach handlers of copy, cut and paste operations to the document.
    *
@@ -629,34 +615,6 @@ FileTransferController.prototype = {
     }
   },
 
-  /**
-   * @this {FileTransferController}
-   * @param {NavigationList} list Drop target list.
-   * @param {Event} event A dragenter event of DOM.
-   */
-  onDragEnterVolumesList_: function(list, event) {
-    event.preventDefault();  // Required to prevent the cursor flicker.
-
-    this.lastEnteredTarget_ = event.target;
-    var item = list.getListItemAncestor(event.target);
-    item = item && list.isItem(item) ? item : null;
-    if (item === this.dropTarget_)
-      return;
-
-    var modelItem = item && list.dataModel.item(item.listIndex);
-    if (modelItem && modelItem.isShortcut) {
-      this.setDropTarget_(item, event.dataTransfer, modelItem.entry);
-      return;
-    }
-    if (modelItem && modelItem.isVolume && modelItem.volumeInfo.displayRoot) {
-      this.setDropTarget_(
-          item, event.dataTransfer, modelItem.volumeInfo.displayRoot);
-      return;
-    }
-
-    this.clearDropTarget_();
-  },
-
   /**
    * @this {FileTransferController}
    * @param {cr.ui.List} list Drop target list.