Remove Gallery.Item when the corresponding entries are removed in file system.

ui/file_manager/gallery/js/image_editor/image_view.js

 // Copyright 2014 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.
 
 /**
  * The overlay displaying the image.
  *
  * @param {!HTMLElement} container The container element.
  * @param {!Viewport} viewport The viewport.
  * @constructor
@@ skipping 635 matching lines @@
   setTimeout(function() {
     this.setTransform_(
         newScreenImage,
         this.viewport_,
         null,
         opt_effect && opt_effect.getDuration());
     if (oldScreenImage) {
       ImageUtil.setAttribute(newScreenImage, 'fade', false);
       ImageUtil.setAttribute(oldScreenImage, 'fade', true);
       var reverse = opt_effect.getReverse();
-      assert(reverse);
-      this.setTransform_(oldScreenImage, oldViewport, reverse);
-      setTimeout(function() {
+      if (reverse) {
+        this.setTransform_(oldScreenImage, oldViewport, reverse);
+        setTimeout(function() {
+          if (oldScreenImage.parentNode)
+            oldScreenImage.parentNode.removeChild(oldScreenImage);
+        }, reverse.getSafeInterval());
+      } else {
         if (oldScreenImage.parentNode)
           oldScreenImage.parentNode.removeChild(oldScreenImage);
-      }, reverse.getSafeInterval());
+      }
     }
   }.bind(this), 0);
 };
 
 /**
  * @param {!HTMLCanvasElement} element The element to transform.
  * @param {!Viewport} viewport Viewport to be used for calculating
  *     transformation.
  * @param {ImageView.Effect=} opt_effect The effect to apply.
  * @param {number=} opt_duration Transition duration.
@@ skipping 295 matching lines @@
 };
 
 ImageView.Effect.Rotate.prototype = { __proto__: ImageView.Effect.prototype };
 
 /**
  * @override
  */
 ImageView.Effect.Rotate.prototype.transform = function(element, viewport) {
   return viewport.getInverseTransformForRotatedImage(this.orientation_);
 };