Get rid of mountPath dependency in Files app.

chrome/browser/resources/image_loader/image_loader.js

 // 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 strict';
 
 /**
  * Loads and resizes an image.
  * @constructor
  */
@@ skipping 24 matching lines @@
       return requestPromise;
     });
     initPromises.push(new Promise(this.cache_.initialize.bind(this.cache_)));
 
     // After all initializatino promises are done, start the worker.
     Promise.all(initPromises).then(this.worker_.start.bind(this.worker_));
 
     // Listen for mount events, and grant permissions to volumes being mounted.
     chrome.fileBrowserPrivate.onMountCompleted.addListener(
         function(event) {
-          // TODO(mtomasz): Get rid of mountPath when possible.
-          if (event.eventType == 'mount' && event.volumeMetadata.mountPath) {
+          if (event.eventType == 'mount' && event.status == 'success') {
             chrome.fileBrowserPrivate.requestFileSystem(
                 event.volumeMetadata.volumeId, function() {});
           }
         });
   }.bind(this));
 
   // Listen for incoming requests.
   chrome.extension.onMessageExternal.addListener(function(request,
                                                           sender,
                                                           sendResponse) {
@@ skipping 169 matching lines @@
   targetContext.translate(target.width / 2, target.height / 2);
   targetContext.rotate(orientation * Math.PI / 2);
   targetContext.drawImage(
       source,
       0, 0,
       source.width, source.height,
       -drawImageWidth / 2, -drawImageHeight / 2,
       drawImageWidth, drawImageHeight);
   targetContext.restore();
 };