Removed most of path utility functions in Files app.

chrome/browser/resources/file_manager/foreground/js/file_manager.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';
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
@@ skipping 1392 matching lines @@
       tracker.start();
       this.volumeManager_.ensureInitialized(callback);
     }.bind(this));
 
     var nextCurrentDirEntry;
     var selectionEntry;
 
     // Resolve the selectionURL to selectionEntry or to currentDirectoryEntry
     // in case of being a display root.
     queue.run(function(callback) {
-      // TODO(mtomasz): Migrate to URLs, and stop calling resolveAbsoluteURL.
       if (!this.initSelectionURL_) {
         callback();
         return;
       }
       webkitResolveLocalFileSystemURL(
           this.initSelectionURL_,
           function(inEntry) {
             var locationInfo = this.volumeManager_.getLocationInfo(inEntry);
+            // If location information is not available, then the volume is
+            // no longer (or never) available.
+            if (!locationInfo) {
+              callback();
+              return;
+            }
             // If the selection is root, then use it as a current directory
             // instead. This is because, selecting a root entry is done as
             // opening it.
-            if (locationInfo && locationInfo.isRootEntry)
+            if (locationInfo.isRootEntry)
               nextCurrentDirEntry = inEntry;
             else
               selectionEntry = inEntry;
             callback();
           }.bind(this), callback);
     }.bind(this));
     // Resolve the currentDirectoryURL to currentDirectoryEntry (if not done
     // by the previous step).
     queue.run(function(callback) {
       if (nextCurrentDirEntry || !this.initCurrentDirectoryURL_) {
         callback();
         return;
       }
       webkitResolveLocalFileSystemURL(
           this.initCurrentDirectoryURL_,
           function(inEntry) {
+            var locationInfo = this.volumeManager_.getLocationInfo(inEntry);
+            if (!locationInfo) {
+              callback();
+              return;
+            }
             nextCurrentDirEntry = inEntry;
             callback();
-          }, callback);
+          }.bind(this), callback);
       // TODO(mtomasz): Implement reopening on special search, when fake
       // entries are converted to directory providers.
     }.bind(this));
 
     // If the directory to be changed to is not available, then first fallback
     // to the parent of the selection entry.
     queue.run(function(callback) {
       if (nextCurrentDirEntry || !selectionEntry) {
         callback();
         return;
@@ skipping 2225 matching lines @@
       callback(this.preferences_);
       return;
     }
 
     chrome.fileBrowserPrivate.getPreferences(function(prefs) {
       this.preferences_ = prefs;
       callback(prefs);
     }.bind(this));
   };
 })();